That you phrase it like that implies that you haven't used atproto very deeply, and aren't aware of how versatile the protocol is, and how many apps it hosts.

I linked you a directory of apps already! You could use any of these! You'd have to set up your own instances to use it on a private service but that's doable, and since you'd have the main atproto systems up, it would be much lower lift than you might expect!

PDSls let's you browse people's PDS. This shows you what apps I've used! It's quite versatile, capable of hosting all manner of social systems. There's nothing else that will give you the ability to build a neat rich social community like this: everything else has specific purpose and intent, and you are rather stuck with that design, but atproto is versatile and generic and ready to form whatever kind of social systems you want with it. To look at what's here and say atproto is very twitter like is to barely scratch the surface. https://pdsls.dev/at://jauntywk.bsky.social