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.
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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.
How is Beehaw not fully federated?
In what way is it not fully federated?
Read their modlog & Instance page. They are more about obliteration rather than federation.