http://u.qdnx.org/file/fsf-20210112T234545-hzjd7w4.html
From the winter 2020 FSF Bulletin (https://u.fsf.org/37z): Professor Christian Grothoff introduces the first free software payment system, GNU Taler! https://u.fsf.org/386 https://status.fsf.org/attachment/2590588