That does seem to have changed since I last cared to look. As dannoffs pointed out - it seems lemmy.ml was unlisted from the join-lemmy.org instances page where previously it was listed as #1 for the Popular section. They also removed the ## users / month metric so the list is no longer guaranteed to be sorted by popularity.
Just last week - lemmy.world was reporting as 87 users/month and lemmy.ml as 1.6k users/month:
https://web.archive.org/web/20230608170721/https://join-lemmy.org/instances
This has of course changed - and unlisting the instance so that it isn't the most popular instance likely has a lot to do with that. That seemed to happen sometime in the last week - I cbf checking every wayback timestamp to see exactly when.
I've been using Kbin myself so haven't been following Lemmy very closely. Only whatever happens to reach my page over on kbin.
Tankies isn't a cute catch-all term for Communists who do have various goals, beliefs, and methodologies of how to transition to, create, and maintain a Communist state. They're Stalinists and/or Maoists who deny well-documented genocides and claim that everything against their ideology is a Western conspiracy theory and the only correct sources of information come from Russia and/or China. In a similar way that Neo-Nazi's claim everything is a Jewish conspiracy theory and the only correct sources of information come from their biased as all hell Alt-Right/Neo-Nazi sources like Stormfront.
This is the exact type of ignorance that I'm talking about when I say people defend Tankies because they were taught the Holocaust in school but never taught about the Holodomor.
E: "The US government is evil so the people the US says are the bad guys must actually be the good guys and are undoubtedly correct about everything. There is no such thing as CCP or Soviet propaganda - that's propaganda from the CIA. Read this article from the CCP explaining it all."