Not from Voyager iirc, which also iirc is by far the most used third party app? Also, for multiple years that what is Lemmy.ml link did not work - it pointed to a post, which I think a later version of Lemmy.ml allowed communities to be made private, and then they never bothered to check what would happen for anyone not logged into a ML account, so it would just give like a 404 not found error for everyone else.
Agreed that it's not impossible to find out who they are - just that ML makes an exceedingly poor representation of the Threadiverse to people coming over here from Reddit. So when they see "death to the USA", and they are... you know, in the USA, they often nope right out and not only never come back, they spread the word to anyone who will listen that that is what "we" here who use Lemmy are.
Btw, in case you were not aware, we are a tankie bar (see: Paradox of Intolerance).
Also, despite all the curation they perform within their garden, they won't allow people to block the Lemmy.ml instance - so it's not entirely a walled garden so much as it is a delivery system for the messages shared by Lemmy.ml users.