I'm involved in a few companies, a few communities, a "public square" (is that what Twitter calls itself?), plus friend groups, social groups, etc.

Each uses a system which might be Slack or WhatsApp or Discord or whatever. Each is siloed with no interop. And the platform cos want it that way because "vendor lock-in"

But as a user I want to access them all and I frequently want to pull ideas from one to the other. Or post to several. Each of these entities is limited by the silo of these systems in their own often invisible way.

Breaking down these walls with forums that are private and also interoperable-at-user-discretion is an awesome UVP.