I don't see how these apps dont eventually get taken down like the Fediverse apps earlier this year. Eventually (probably once it's polished enough to be usable) the deplatformed communities will discover SSB and then Google/Apple will take the apps down.
Manyverse’s work on room servers version 2 will be huge.
The rooms will function a lot more like real life buildings. Some will be private like homes, some will be public like libraries, others will be restricted like a club.