Bounties were a great way for hobbyists to get some free token/altcoin, a great way for ICO managers to stretch their marketing dollar, and, it turns out, a great way to grab the attention of the SEC.
With the SEC cracking down on bounties (and perhaps airdrops, etc.), it seems like the bounty party is over.
Published some thoughts today in Hacker Noon:
https://hackernoon.com/rest-in-peace-ico-bounty-programs-fc1e1e04e867