The number of bitcoin campaigns has decreased over time, but price of bitcoin has increased as compared to altcoins. Nothing important happened except the number of bounty campaigns has decreased significantly. One can get hardly a few of good bounty campaigns at present. I think people are losing their faith in bounty campaigns.
Yeah, genuine projects have drought like seasonal rivers. I came back after long time too and can't see any good bounty from the reputed managers back then like Sylon, Woshib, Wapinter, ColorlessK, etc.
ICO market is near to death, we better look for other ways to make money.