You can set your feed to only show subscribed communities in your account settings.
How can I block all Lemmygrad content? As a user can I block an instance? Are there instances that already block them?
How can I block all Lemmygrad content? As a user can I block an instance? Are there instances that already block them?
Hopefully you'll get things sorted with getting subscribed as default view. I agree that it would be useful to be able to subscribe to a whole instance, but I think there are quite some technical hurdles to get there.