Downvotes are an actual use case of stake. And how someone uses their stake and money is up to them.Of course, muting in tribes is a thing too and proofbrain decided to use it on one of the few people that actually put real money on proof of brain instead on relying on votes. I have a feeling that won't work out well for the price of pob. POB had essentially just 2 big investors up to now, one started to power down and I doubt more will come after this action.