Why in the world would anybody use Matrix if you made it closed-source (as you've so cleverly disguised it, """open""" core)? I use it daily to talk to pretty much everyone I know. It isn't as
good as other open-core messaging projects. You guys based your entire value pitch on "OtherPlatform but Actually in the Spirit of Open Source."
You aren't as good as Signal at being secure.
https://nebuchadnezzar-megolm.github.io/
You aren't as good as Telegram at being useful or comfortable, and you're especially not as good for groups.
Signal is in practice open core, given how little they do source releases of the server. Telegram keeps their clients open source, mostly, but not the server.
The value you provide is from the fact that it's open source and also easy to develop for, but you aren't even as easy to develop for as IRC.
Laying in bed with the wolves of capitalism is stupid for a project like yours. Bid on government projects and grants, fundraise based on features, or figure out projects that benefit from economies of scale that would leave you competitive (P2P Matrix dedicated hardware would be an easy sell to some governments and much of your audience) while not closed. Don't fool yourself into thinking destroying the thing that makes your creation valuable is the way to succeed. It's not.
If you've already started with layoffs, the damage might already be done.