Payday loan places already do this. It's pure exploitation of the poor.
BNPL platforms know what you're spending on, and whether it's a one-time expense that you're spreading out, or a rent/utility payment that's going to come due next month as well.
Cancer and heart disease are both pure health problems, but insisting on handling them similarly would be a mistake. Not that payday loans and BNPL are that far removed, maybe more like liver failure and kidney failure.
(And also, though I don't begrudge them much, also, a special hell for those who offer this up to companies for a cut).