https://github.com/scribble-rs/scribble.rs/releases/tag/v0.8.18
Version v0.8.18 comes with a bump of the default player limit and the option to configure it yourself for your self-hosted instances!
Simply edit your environment configuration, for example:
LOBBY_SETTING_BOUNDS_MAX_MAX_PLAYERS=1000
This will allow lobbies for up to a thousand players, while leaving the default value untouched.
So each lobby creator can still decide whether they want to allow this.