For bitcoin donations, you can go to [1], which gives the address as 12LKeo24XCzgz6ASSxcUa8BvUfzkEyCpGq [2]. The address is not generated per user, and is dedicated to GnuPG.
[1] https://www.wauland.de/en/donation.nojs.html
[2] https://blockchain.info/address/12LKeo24XCzgz6ASSxcUa8BvUfzk...