Social networks, like all network-based software, have very little competition on a feature-by-feature basis.
The network effects are so insanely strong, that any given new competitor can't just compete on the level of an individual feature or two.
The feature would have to be transformatively great to be worth a new network starting.
The big networks have to be careful about adding new features.
So we're left with wildly too little software in the social realm.
At least, in our current physics of trust, which are based on the software.
There are tons of great social-adjacent use cases languishing and non-viable, waiting to spring to life in the right conditions.