I took out a number of BNPL loans last year and it was never because I couldn't pay the full price but rather if I was getting the money at 0%, "free money". But I was never the target customer of these places, I was just taking advantage of very good terms.
Now that Affirm (and I assume most other places) are charging a floor rate of 10%, that second group of customers are no longer customers. I'm not sure how significant this group is but I'm sure it's not an insignificant number. Since these places make most of their money on transaction fees rather than rate premiums and fees on the back end, this could really put a dent in their business.