Perhaps it is time to build a serious platform agnostic reputation system. That isn't stars, followers, age or upvotes. Something like page rank but for users. If you endorse someone else you pay for it. Imagine a lab or uni assigning a diploma to a public key. They would hope one would do something useful with it which entirely depends on how useful the diploma turns out. Having lots of well behaved endorsements would also reflect gloriously onto the entity. Bots can participate too. If we can get lots of useful work out of a swam of sleeper agents we still have to catch them in the act but that should get increasingly easy.