lemm.ee has shut down at 00:14 UTC.
unfortunately I realized too late that I have had hundreds of saved links to posts and comments from there, so I did not have enough time to save them, but anyways it is interesting that maybe a third of the post links I could try were dead. I think linkrot is happening much faster here than on reddit, even if just counting deleted posts.
It’s not centralised though. It’s quite decentralised actually.
As for your “nazi bar problem”, I’d suggest you review the relays you connect to. That’s the beauty of free speech, and power of choice.