Your Core as Competitive Advantage: From Cost Center to Moat

WAU Marketing

7 hours ago

5 min read

The question almost no one on your leadership committee asks well isn't "how much does the core cost us." It's "how hard would it be for a competitor to copy what our core lets us do." That second question is what separates a cost center from a moat.

Throughout this program we wrote about launch speed, data accessible via API, banking-as-a-service, financial inclusion. Each topic looked independent. They aren't. They're all consequences of one underlying decision: how your core is built. This post closes the loop. It's the "why everything else matters." And the thesis runs against most accounting intuition: the core isn't the expense line to squeeze, it's the asset that decides whether you compete or get copied.

The reflex that kills the strategic conversation

At nearly every bank in the region, technology lands in the budget as a cost. And it's a big one. Consulting firm BCG, in its Tech in Banking 2025 report, estimates that technology absorbs on average more than 10% of a bank's revenue, and that 60% of that spend goes to "run the bank"—keeping what already exists alive—as BCG reported. On top of that, BCG projects global banking IT spend will keep growing at a 9% compound annual rate, above inflation.

Seen that way, the reflex is obvious: cut. But that number hides the trap. When 60% of the budget goes to sustaining old systems, it's not that technology is expensive: it's that the legacy core is expensive. You're paying a complexity mortgage, not investing in capability. The cost center isn't the technology; it's the wrong architecture.

What the neutral evidence says: the core drives results

This is where the data changes the conversation. It's not a vendor's opinion; it's measured correlation.

McKinsey analyzed digital and AI maturity against financial performance and found that companies leading in these capabilities outperform laggards by two to six times on total shareholder returns (TSR), across every sector studied, in its "Rewired and running ahead" analysis. And the gap widens on its own, because the tech advantage compounds over time.

In banking specifically, the numbers are just as clear. Between 2018 and 2022, banking digital leaders achieved an average annual TSR of 8%, versus 5% for laggards, according to McKinsey. Three percentage points a year, compounded, is a chasm of value. The lever? Integrating digital and data across the whole customer journey, cutting cost to serve, and moving the business to automated channels. None of that is possible on a core that only speaks in batches.

What a core turned into a moat looks like: two cases

Theory gets concrete when you look at who's already done it.

DBS, the Singapore bank, decided a decade ago to stop thinking of itself as a bank with technology and start thinking of itself as a technology company with a banking license. The financial result isn't marketing: in 2024 it reported a 51% TSR—one of its best years—an 18% ROE, and S$11.4 billion in net profit, per Euromoney, which named it "World's Best Bank 2025". The bank itself quantified AI-generated value at S$750 million in 2024, with hundreds of use cases running on its platform. That value doesn't exist without the core that supports it.

The second case is from our region and is even more telling. Nubank built its bank on its own technology from day zero, and it shows in its unit economics: it closed 2025 with a monthly cost to serve per active customer of just US$0.8 and an efficiency ratio of 19.9%, with a 33% ROE across 131 million customers, according to its official fourth-quarter and full-year 2025 results. A traditional bank in the region runs at efficiency ratios that double or triple that figure. That difference isn't talent or luck: it's architecture. It's a core that scales without the cost scaling with it.

What exactly the moat is (and why the rival doesn't copy it)

A defensive moat—the term value investing made famous—is an advantage a competitor can't easily neutralize. A modern core creates four moats at once, and they're exactly the threads we wove through this blog:

Product speed. When launching an account, a loan, or an insurance product takes days instead of quarters, you capture market while the rival is still in committee. Speed can't be copied with budget; it's copied by rebuilding the core, and that takes years.
Data. A core that exposes everything via API, in real time, feeds risk, personalization, compliance, and AI. The bank with accessible data doesn't compete on better models; it competes on better fuel. The laggard can buy the same AI model and still lose, because its data is buried.
Ecosystem. Banking-as-a-service, fintech integrations, embedded finance: all built on APIs. The bank that is a platform becomes the pipe other businesses run through, and leaving that pipe has a cost. That's a moat.
Unit economics. The Nubank case shouts it: when serving one more customer costs almost nothing, you can lower prices, reach segments unprofitable for the rival (inclusion that actually makes money), and still earn margin. The core that's cheap to operate decides who survives a price war.

None of these four is bought with a license or fixed with a patch. That's why they're a moat: they require the architecture, not the check.

The decision in front of your committee

Here's the honest choice. You can keep treating the core as a cost: squeeze it, maintain it, justify it year after year, and watch the 8%-versus-5% gap open against you while a digital competitor sets the market price. Or you can treat it as what the evidence shows it is: the asset that decides your margin, your speed, and your defensibility.

IT spend is going to rise 9% a year anyway, per BCG. The question isn't whether you'll spend; it's whether that spend builds a moat or pays a complexity mortgage. That's the whole difference.

How we see it at WAU

At WAU we don't sell an IT project; we build the moat. We design modern cores for institutions across the region: data exposed via API in real time, the ability to launch products in days, unit economics that scale downward, architecture ready for ecosystem and AI. Not so you have "better technology," but so you have something your competitor can't copy with a check.

Everything we wrote in this blog—speed, data, BaaS, inclusion—converges here: a modern core isn't a cost center, it's your most defensible competitive advantage. If you want to see how defensible your institution is today and what it would take to turn your core into a moat, let's talk. 👉 Book a conversation with our team.