Each instance admin decides which servers to block for themselves. If you visit the info pages of some systems they will list blocked systems, and there are a lot of them.
There are some very unsavoury communities out there. Blocking usually revolves around how effective moderation is.
As an example you can see a list of servers blocked by mastodonapp.uk on the About page.
Each instance admin decides which servers to block for themselves. If you visit the info pages of some systems they will list blocked systems, and there are a lot of them.
There are some very unsavoury communities out there. Blocking usually revolves around how effective moderation is.
As an example you can see a list of servers blocked by mastodonapp.uk on the About page.
https://mastodonapp.uk/about
Oliphant maintains a minimum block list that most systems take as a starter list.