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.
There’s several solutions, I was just stating the “at least” solution because everything needed for it is already present. You just need to remove functionality depending on the type of service you want to host.