Main problem is down to the mentality of players left playing Mir. Usercount > content/features to most of the players left. A false belief that the PvP is better with more people, but generally its there are more people lower level than them to 1-2hit, rather than actual bigger guild v guild PvP over a boss/objective.
People are saying create and run a server as a hobby, dont make it p2w etc. yet they want a AAA game service from these GM's with a dedicated GM/team who can provide a 24/7 service. A bug free game, yet they only play beta to work out the best way to gain an advantage and not assist with actually testing for issues. If you want that 0 bugs and 24/7 support then expect to fund that level of time for the server team. It takes a minimum 3 months to create any decent server that is not just a release from source or updated from last iteration of server. 6-12months for those ones with good customisations and new features (team size depending), even longer for anyone doing it as a hobby.
Players also want to spend to win. From the brief time running a mir3 server a few years ago, with a gameshop focussed on cosmetics with just a few exp pots & pig reroll pots you could classify as p2w, I can tell you people who play Mir are mainly interested in the p2w aspect of the game shop. The "p2w" sales outnumbered the non-p2w sales about 10to1. If the gameshop doesn't have it, then players will have others willing to farm and sell them gold/items/levelling to get a head.
Then you have the "hardcore" players who can still play Mir 12-15hours a day. Either complain if you have any sort of catchup/afk/shop/instance mechanic for people who only have a few hours in the evening. They love to hunt players significantly weaker than them just to give themselves an ego boost, rather than tackling the content appropriate for them. If you put in measures to deter this they consider it un-mir like. This behaviour however just kills the usercount as it is not enjoyable for the lower level guy to be getting smashed around in their appropriate area by a guy who should be numerous areas ahead and not near this content anymore.
Then you have the players who play servers solely to sell gold/items to feed into the core group of players willing to buy it. They will jump on at the start to make the best profit then jump off when its not worth it anymore.
Doesn't matter how much content, new features etc a server puts out, the community still behaves the same, chasing the next fresh server for the new user count hype and to try to be #1.