I found the article's description of how BNPL structurally differs from credit cards interesting, as it is a reasonable explanation for how BNPL can serve the unbanked and still have functioning credit risk models:
> Even with adverse selection for BNPL, the underwriting is for each transaction, not for all monthly spending like that in credit cards; so if a consumer misses a payment, the BNPL provider can stop lending immediately, as opposed to the credit card company which has to underwrite the person’s full ability and willingness to repay their debts. This tech-enabled granularity allows for legibility and hence greater precision and predictability.