I think it would work nicely if each public university had their own instance. Since it’s government owned, it would be illegal for them to censor other scientists. I guess if the public university web was big ebough, they could make private universities and other institutions agree to be censorship free, plus moderation would be transparent and in the open. Not sure how moderation would work exactly, it should be fairly self regulating if users are exclusively credentialled experts with real names attatched to their accounts.