It should be noted somewhere on the login screen, maybe with an asterisk, that beehaw.org is not fully federated, restricted, however it needs to be termed.
No one is ever “fully federated”. Even Lemmy.world most likely blocks some spam/nafarious instances. It would be tough to define what fully federated would mean.
I think the better approach would be a message telling you when you’re trying to engage with an instance that isn’t federated to you.
https://github.com/maltfield/awesome-lemmy-instances
Scroll down to the full list. The BI column is how many other instances that instance is blocking. BB is how many instances that instance is blocked by.
Beehaw is currently blocking 387 other instances. Lemmy.world is blocking 1 tiny instance for some reason. Beehaw is blocked by none. Lemmy.world is blocked by 2.
How is Beehaw not fully federated?
They’re defederating with instances left and right. And pushing for mod tools for the communities hosted on the instance but for users from other instances. They seem more interested in sculpting a walled garden with the illusion of agreeableness.