This server is called GoPlay and it is a survival world that tries really hard to stay fair and clean and work for a long time.
The main thing is their SMP. They have a brand new spawn and you can use random teleport in the Overworld and the Nether and the End. You can claim your land and set up player shops. There is flight time you can earn by voting and you can use that flight only inside your own claims. They also use custom 1.21.4 packs for bases and cosmetics plus there are player vaults and the dragon can respawn so people can keep going back to the End. When you vote you get free crates and every perk on the server is earnable so nothing is locked behind paying real money.
They also have a vanilla world that is very close to pure Minecraft. It has no extra mechanics and it still has random teleport so you can explore easily.
The owners pay for the server out of their own pocket and they do not expect players to buy anything to have fun. If you want a modern survival server that stays fair and does not go crazy with features this one fits that style. It runs on version 1.21.
