They can block content on their server, but as long as one server hosts the content, it would be available to anyone who wants to see it, which isn't how things work on Lemmy unless you want to sign up to a bunch of instances to make sure you have access to everything.
If you just want to see the content, you don't need an account. You can just pull the data, like opening up a different website.
What you want is the ability for some other server to push content to a server that the admin might have chosen to say "no, I do not want to have data from them, and I do not want to have my resources used by these users".
They can block content on their server, but as long as one server hosts the content, it would be available to anyone who wants to see it, which isn't how things work on Lemmy unless you want to sign up to a bunch of instances to make sure you have access to everything.
If you just want to see the content, you don't need an account. You can just pull the data, like opening up a different website.
What you want is the ability for some other server to push content to a server that the admin might have chosen to say "no, I do not want to have data from them, and I do not want to have my resources used by these users".