I’m working on a project that needs a similar approach to slack or discord. I know about matrix, but the person I’m working with said to be open to use a fediverse alternate when I tell them I didn’t want to use slack. I mention matrix and the fediverse as an alternative and they asked me a good fediverse option.
It’s needs to be good for team collaboration, easy to set and be able to maintain original images quality.
The fediverse as most people on here would reference that term, isn’t really designed for what you’re looking for.
Matrix effective is what you’re looking for. The only alternative to that would be something like TeamSpeak 6, which is a closed federated chat system (that’s still not really fully baked).