Thanks, @flypig and @sethdove for the kind words!
If you’re really keen on donating, I have a Liberapay account at https://liberapay.com/rubdos/. I’ve stopped to refuse donations, although I have to tell you: I am full time employed (at the Vrije Universiteit Brussel as researcher in applied cryptography), and money sadly doesn’t buy me time. It does buy me coffee and beer though, which is of course appreciated 