I always thought it was interesting that the BNPL loans’ interest is subsidized by the retailer, which pay the premium in order to improve the chance of a sale (hoping to hone in on those who can’t afford it now and make it back on that extra spend). Which means high credit score, wealthy spenders could put everything they can on BNPL plans and profit the (minuscule) interest over time, but if you can do that on big purchases, maybe it’ll add up. Same way credit cards work, if you have the cash flow and always pay them off in full, you can make a few bucks in a HYSA for the 40 ish days before the statement.
I can see a future where a BNPL loan is not offered if the signals the checkout page collects indicates wealth, since they don’t have an issue of cash flow stopping a purchase. Imagine a loan that has a credit score maximum, not a minimum.