It's also strange that it happened twice, first with amazon links, then they started injecting affiliate data for crypto platforms instead.
Firefish instance probably crashed :p It's blocked by Easylist because they use Plausible Analytics - despite it being privacy friendly, easylist blocks it because it is analytics software
See here: https://lemmy.dbzer0.com/comment/1375337 - This might answer your question!
I'll try to explain it from what I know/remember. fmhy.ml and fmhy.tk were backup mirrors of the fmhy wiki, though the UI on both of them wasn't great. fmhy.pages.dev is the new wiki with a theme by the weeb wiki!
They had those three sites as backup wikis, fmhy.ml got a facelift at some point so that UI is better, whereas fmhy.tk remained the same. Both fmhy.ml and fmhy.tk were taken down around the same time. fmhy.net was bought by the people behind fmhy, page looked like this for a while, then the fmhy.ml wiki was restored on fmhy.net. Now there's two backup wikis!
pages.dev is a domain owned by cloudflare, it's used to host the free cloudflare pages - you can't host a lemmy instance through that domain. fmhy.pages.dev is the newer wiki hosted on cloudflare pages. fmhy.net is owned by the people behind fmhy, they can add sub-domains to point to the Lemmy instance as it's owned by them as of now.
They made a private Calckey (now called FireFish) instance a while ago for Lemmy updates - whenever the instance would go down, there would be a post on the FMHY Calckey account. You can read about what happened here and what they are planning on doing about it: https://very.bignutty.xyz/notes/9hg4dquksvbha67h
Best case scenario is that they can get the fmhy.ml domain back, only if the Mali government opens registrations again. It looks as though they will be starting from scratch with fmhy.net instead.