I think maintainers would definitely love more some monetary support rather than just a thank you, specially those doing it in their free time (since some maintainers of big open source projects are well established paid employees).
The problem is that it is hard to transfer money over the internet. I just wanted to know what bureaucratic hurdles one has to jump in Germany to even be able to receive donations on your webpage. I don't want to go into the gory details, but just come with something that I say for years very often: The surest way to become a terrorist very fast is to read up into law. And this is only for being legally able to recei…
I paid a bug bounty to someone in Germany from Canada with Bitcoin. I guess I'm a terrorist now.