

Not bad, but I personally don’t like centering the attention on platforms because then we are drawing attention away from the instances. By centering attention on instances, we normalize instances and allow them to thrive.
I’d say something in the direction of Discussion Instances for communities.
I think the word “open instance” could be used in place of decentralized. So when we frame it as open discussion instance, it is a reference to how the instance is decentralized.