Some of us out here actually own some cryptocurrency and it seems like it's being used occasionally on the Internet for virtual tip jars so that people can show their love.
I don't really use checking accounts and credit cards and I know that the gift card I do use isn't compatible with the website Gina's currently using.
I guess I'm suggesting that if people like Gina and the plugin authors were to create Bitcoin and Ethereum wallets and were to then generate receiving addresses for same, they could publish one QR code each with respect to their work.
For example, you'd come to expect that the related README.md on your github's repository would at the bottom have two QR codes, one each for the two popular crypto coins. This would promote generosity, one would hope, in those who have the stuff.