Various issues: C used (huge flag), little progress yet, arbitration can't help in subjective/unverifiable/misleading data situations, anynomity will drag in the trash-sellers by the dozens, entirely unsourced data -even when true- is not as useful as sourced stuff (which you'd call "actionable"), de-duping information is impossible, what's the arbiters' motivation to be honest and not attempt to contact either side for bribes (or vote against "truth" for lolz), etc.

But mostly: Just think of the Signal/Noise ratio. Everyone will be trying to abuse this.

Even the dumbest, shotgun, numbers-game approach would have returns: Keep listing seemingly interesting stuff that is actually misleading/incomplete/bad/resold/... and eventually some of your transactions will not be reverted by arbitration.

And this is anonymous crowd-funding, you say?