@welshpixie @AdaShovelace This is the section I was thinking about.
#CommentAltText (couldn't fit it in my client so pasting here):
Image of Mastodon's Trademark info web page, which states:
"Server guidelines
If you run your own Mastodon server using the Mastodon software, [...]:
You may not use the Mastodon word mark, or any similar mark, in your domain name, unless you have written permission from Mastodon gGmbH."