I play old school maplestory on maplelegends. They have strict “no real world trade” rules and no pay to win. It really is just the game how it should be played, which really highlights all the flaws in the game (there are many)

Obviously the main draw is nostalgia, so if it’s something you’ve never played it won’t have much value, but the community is great and it’s an mmo with lots to do and endgame content to aspire to