Definitely, even airdrops promised by ICOs don't come at all. I guess the reason why this happens is that some ICOs just don't get their target sale or sometimes they don't really manage the bounty well. If this continues, the bounty quality would really decline and would most likely discourage a lot of people to just join any bounties. We would just start to be more choosy with projects and maybe this could help to lessen scam projects too.