this question is a great one and it is something we need to act on as soon as possible because it is very sure that there are many cheaters on proofofbrain community even on pobStreet community especially and other community as will.
and this will not help the community because many people will just come into this community to comment and receive their pob,spend it without staking,so i think they should just make this staking much more compulsory for everybody in proofofbrain community.
there should be an amount of pob for everybody to stake composerily,this need to be work on as soon as possible.
in conclusion, greetings to everyone and God bless you all