Different fandoms would congregate in different home instances – Which is ultimately just an aesthetic difference but still.
It’d be a lot more resilient due to decentralisation. I’m old enough to remember when the entire concept of fanfiction was something considered litigious and anyone who wrote it felt they were skirting on the edge of the law. People forget how easy it is for those times to come back. All it’d take is 1(one) corporately-backed author making a stink about it. Decentralization would make it harder to curb.