For some larger purchases on a 12 month plan, leaving the money in savings loses me 1.5% cash back but gains me around 3% interest (after accounting for the depleting principle).
It would be stupid not to do it sometimes. I don't really get the financer's benefit. Though maybe it's because I do pay it, and if I didn't there would be 200% APY or something.
The parent poster is confusing BNPL with cobranded cards like Room 2 Go credit cards that have special promotions with “0% for x months”. It’s a regular credit card where the minimum payment won’t guarantee that you pay the original amount off in “x” months, but you only have to pay 2% of the balance. These have always shown up on your credit report.
They are “deferred interest” plans where if you don’t pay the balance off in $x months it will charge you back interest.
[1] Nowadays you can often also use the network with other methods, like a debit card, but those alternatives still aren't universally accepted like credit cards are.
If you decide to save $25/mo for a $100 product, that is 4 months for you to change your mind, have an emergency suck up that money, or score a lower price by waiting for a sale. But for some segment of the population, they will close on a pay-in-4 right now instead of waiting, and that is guaranteed money.