dat exists for 13+ years and has plenty of apps build on top of it. e.g. https://cabal.chat https://keet.io https://holesail.io https://maps.mapeo.app https://sher.fm
https://agregore.mauve.moe
...list goes on. there are dozens listed in https://dat-ecosystem org and those are anyway just the tip of the icerberg.
it totally hasnt had its fair shake in some circles imho
try all the above if yoy want.