This server lets you host your own Minecraft world for free and it says there is no catch. You join the main server and use a command to make a world.

You can pick templates like Skyblock Survival Oneblock and Amplified or you can upload your own world. New worlds start small with 2 GB RAM and space for 3 players.

If people play and boost your world it scales up by itself. It can grow up to 8 GB RAM 50 players and up to 20 mods at the top tier. You can run Vanilla Fabric or Forge as long as the version is 26.1 or older.

The big idea is you can get paid when players boost your world instead of paying monthly hosting. The community worlds are live right now and it is in beta testing.