You aren't allowed to discuss pservers here. In terms of official servers
Flyff = Dead
Ragnarok = So pay to win if you ask advise on how to make okay gold everyone will tell you to cash + freemium service
Runescape = I quit around the time that Guthix map was put in ( 08 maybe? ) was an okay game, but it really started to ..... feel off to me, idk.
The issue with classics is they are from a time where it was expected to take years to be "good" in the game. A lot of classics are also VERY offputting for new players to join, as they already have established player bases, and the economies are usually structured in a way for the cash shop to dominate the markets, since a lot of players continueing to play these games don't like to shell out money on them ( just look at why Lucent Heart shut down the first time. And before anyone says that was because beanfun closed its US doors, no, Lucentheart shut down before this ).