Board Thread:Support Requests - Community Management/@comment-35578151-20190825213509/@comment-366087-20190826021740

Unless the user is problematic (and Wow! Be careful about handing out bureaucrat as easily as you do, troublesome 'crats are difficult to remove), Staff will usually recommend leaving them as they are, especially after such a small period of inactivity. They may decide to return someday.

BTW, a bureaucrat can remove themselves. Have you tried asking them to do so?