This would probably only affect the people with the worst credit scores I imagine. I just don't see a ton of 800+ credit score people deciding to spend 5 payments of $20 for a pair of $80 shoes.
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For a 3 month BNPL loan to be worth it, HYSA rates must be over 6%, and actually a bit more due to the time value of money; you get CC reward cash after the statement period but it takes 90 days (and up to ~120 days) to get three monthly interest payments.
People with good credit may use them, but it makes zero sense to do so. You always come out ahead by using a credit card and paying it off immediately unless the high yield savings rate is 6% or higher assuming a BNPL loan term of 3 months. Beyond that, it does make sense to use them, like Apple’s 12 month no interest on Apple products with the Apple Card.
Lots of people with good credit are not maximizing credit card rewards and sign-up bonuses, either. Humans are not homo economicus. (And just as a factual matter, there are sometimes longer BNPL terms than 3 months, which changes the math on what is "optimal.")