Don't know about PayPal and credit cards, but if instead you would say 'other crypto currency's, then, yes, excellent point. I've had a PayPal donate button on my author page for years but frankly never got a single donation. PayPal and credit card solutions in general are a truly bad fit for micro donations. Other than the PayPal donate button,the dogecoin donation link though did really well. Low transaction costs on small payments made it much more suitable for micro donations and thus, eventhough doge is just a minor coin, a much bigger success for me than fiat payment options. I thus think if the platform would take your idea but use crypto currencies instead, it could make for a true winning combination.