In the Voyager bankruptcy, customers successfully reversed ACH payments by claiming fraud. The financial liability didn't fall on the bankrupt Voyager but on its partner, Metropolitan Commercial Bank. This shows how fintechs can unknowingly expose their banking-as-a-service providers to catastrophic, unpriced risk.

Unlike typical co-branded credit card portfolios that sell for a premium, Goldman Sachs offloaded the Apple Card's debt to JPMorgan at a significant loss. This underscores the program's unprofitability, driven by high defaults and operational costs, despite the prestigious Apple brand.

Stripe's potential acquisition of PayPal is driven by a desire to gain PayPal's strong consumer brand and access to customer bank accounts. This would let Stripe bypass expensive credit card interchange fees, a significant cost advantage that is more valuable than PayPal's technology.

Co-branded card partnerships are far from ancillary income. For airlines, this stable, high-growth revenue stream can account for up to half of their total mid-cycle profitability, boasting operating margins of 35-50% in an industry that struggles to reach double-digit margins on its core business.

PayPal's primary profit driver isn't interest on user balances. It's capturing the full transaction fee (e.g., 2.9%) on payments made from a user's PayPal balance. This avoids paying costly credit card interchange fees, dramatically increasing their margin from ~100 bps to nearly 290 bps.

The acquisition's goal is to combine Stripe's merchants, PayPal's consumer accounts, and Block's point-of-sale infrastructure. This creates an end-to-end payment network that can bypass traditional credit card rails, establishing a formidable new competitor to the Visa and Mastercard duopoly.

Unlike other tech verticals, fintech platforms cannot claim neutrality and abdicate responsibility for risk. Providing robust consumer protections, like the chargeback process for credit cards, is essential for building the user trust required for mass adoption. Without that trust, there is no incentive for consumers to use the product.

A surprisingly large portion of high credit card APRs covers operating expenses, particularly marketing. Issuers like Amex and Capital One spend billions annually on customer acquisition. This spending is passed directly to consumers, as higher marketing budgets correlate with higher chargeable rates.

Growing prediction markets like Polymarket and Kalshi tolerated high fraud rates until their payment providers (like checkout.com), pressured by Visa and Mastercard, threatened penalties or de-platforming. This external pressure from upstream partners proved a stronger catalyst for action than the company's own financial losses from chargebacks.