Everything here is basically text and maybe images if your lucky. In order to make it into a Discord or Zoom competitor you would need to solve far higher bandwidth things like HD video and low latency audio, and both of thouse are fundamentally very different things for a server to handle as compared to high latency short text messages.
You could probably link account sign in, but any real-time stuff would likely be limited to within that single instance unless you create a whole alternative method of federation that would still only be available between thouse certain supported instances.
It’s also a whole lot more expensive to host, unless you go peer to peer in which case good luck, and vulnerable to bad actors massively running up hosting bills even if you can protect against denial of service attacks.
It would be nice to see, but there is a reason why Matrix is the closest anyone’s come and it’s still more a proof of concept then an actual platform you could direct family or random strangers to.