PayPal doesn't cost significantly more than what a small online place can get from other payment processors. It's something like 3% + $0.50. That's also not much more than what a small business can usually get for in person credit cards.
This site does use buymeacoffee.com, which appears to be a dedicated payment platform. Its transaction fee is apparently 5%, which is steeper, but better for these small donations because of the lack of a fixed fee.
Thank you - I started my diary in Oct 2000 and I didn't hear the term until after then. Or I chose to ignore it, it's that long ago I can't recall :)
I have updated my comment above.
It is desired enough that plenty of developers license third party libraries that roll their own device attestation, instead of or in addition to Play Integrity.
This site does use buymeacoffee.com, which appears to be a dedicated payment platform. Its transaction fee is apparently 5%, which is steeper, but better for these small donations because of the lack of a fixed fee.