[michalbacia]

Mighty Networks https://www.mightynetworks.com/about started in 2017 as something similar to what you're describing. Now they've shifted to "powering brands and businesses that bring people together via online courses, paid memberships, events, content, and community–all under your brand, instantly available natively on every platform" Might be relevant for you

[yurylifshits]

Yes, we follow them closely. Key differences:

— Mighty's main focus is on top-down content, not messaging with organizers and among members.

— Mighty's communities are all separate, with individual accounts and sometimes even separate mobile apps. On Openland people have just one account and inbox for all their communities. Much simpler than Mighty, Slack, or Discord.