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I had a really similar idea I'm working on and this can be solved by federation, and allowing users to move freely between servers. A gicen server could have its own moderation list. If you want to bypass it you'll need to connect to a server in another juridiction.

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.

I guess you could create a global set of labels specifically for that and make the client apply rules corresponding with the local laws.