Some problems came from the bounty managers. But i can't denied that many ICO project have behaved like you said. I have a solution, but i think none project want to do. My solution is, 50% of bounty funds will be paid in ETH, and this will fund must be in escrow, controlled by audited third parties. Bounty hunters are best marketers of all ICO projects and they must be respected, behaved as a official worker of the company.