This might've changed but 10 years ago the small shop next to my school said they wouldn't allow card payments of under 1 EUR because they'd be losing money. In Estonia
They should almost just make it so the blaze plan of firebase or other cloud services has a $1 non refundable pre-payment so they can just whittle away at the pennies instead of getting charged processing/transaction fees on a $0.01 transaction. Tops up to $1 if it goes to $0
I think people would pay $1 to enable the paid plans. If you're going that far, you're getting $1 of use out of it.