I've talked about this elsewhere, but the whole DNS system seems US-controlled and broken to me, and is essentially a privatization of the commons. A lot of historically free ones now seem to be getting yanked. So far I think lemmy.ml has been safe because its a paid one, but its a concern. Either way, if any of these have to move domain names, it'll be an annoying hassle, but it won't mean the death of lemmy or anything.