All this talk of user-defined moderation is great, however this is fundamentally incompatible with content that is legal in one jurisdiction, but is illegal in another, and thus must never be served in the first place to users of the second jurisdiction.
I wonder at what point the difficulty of this sort of problem will become a significant political pressure to homogenize laws worldwide or incentivize new types of international cooperation.
When there is a balance of power and amicable relations between the parties.