The software part of this would be easy. People will literally write it for free, out of the sheer joy of building Free & open source software. The part the state needs to do is bootstrap a network effect that leads to people actually using it.

I guess they’ll need to employ a few engineers to add enough lines of code to rocket.chat to make it competitive with Teams levels of slowness.

Fixing network effect is easy for hegemonies, just ban the competition. You can use national security or save the children pretext in democratic countries.

US took over TikTok forcefully, Europeans are looking into forcing their contenders into domination but if it doesn't look like working they can just use the US tactics.