And had you been on an instance that was defederated you'd have to create another account to acces their community, just like a separate forum, which I exaplained in the other post would be the better choice.
Because it doesn't make sense to have that kind of manual approval registration system aimed to only have specific users in the community that share their values, so they clearly want to crontrol who can and cannot post there... and then being on a plattform where users can just join another instance or even create an instance for their own and then post what they want on beehaw and the only way to prevent this would be proactively blocking all other instances and working with a whitelist instead.