Room addresses/aliases (like #matrix:matrix.org) must point to a single room (in fact, they point to a room version, so when rooms are upgraded, addresses must be pointed towards the new room). But for communities, a better way to organize the rooms would be spaces. Spaces can be joined. Spaces can contain rooms and other spaces. Like discord "servers" (guilds), but more flexible.
“The fact that the EU interior ministers want to exempt police officers, soldiers, intelligence officers and even themselves from chat control scanning proves that they know exactly just how unreliable and dangerous the snooping algorithms are that they want to unleash on us citizens,” commented Pirate Party MEP Patrick Breyer.
It would be nice to be possible to do the hardening of services via allowlisting instead. E.g. AllowNothing=true and then start adding what is allowed to make the service function.