There is a self-selection that gives the fedi a particular culture. E.g., I am here because I find targeted adtech social media disgusting human torture chambers.
But to think of the fediverse as "positive" oriented is strange. There are recurring episodes of toxic attacks on anybody expressing an opinion that doesn't fit the echo chamber and that's just my limited graph.
Being open source, decentralized etc is not a magic wand that fixes inherent limits of online worlds.