I was looking for a feature that could block / hide all pornographic posts from all buttons and search bars on GNU Social. If necessary, by blocking all access to other fediverse servers that do not have a strict policy against pornographic content (if this is not feasible, then by blocking all other fediverse servers outside GNU Social, and if this is not feasible too, by just showing content from the server I'm in).
Please consider developing this feature.
I think there are no that function.
SensitiveContent and Embed plugins are useful for hiding content.
GNU social has no server domain block. You can do it by server configuration (.htaccess and so on).