Just a reminder that "Mastodon" is the software, not the specific service provider. Mastodon.sdf.org is different from, say, Mastodon.social even though they run the same software.
If you haven't already, you should contact the admin for that instance with your concerns. The contact the site lists is mastodon@mastodon.sdf.org
https://beehaw.org/post/1051925