I believe ICO are still good source of gains or passive income, compared to bounty hunting i think they are more of a long term purpose than short term just like doing campaign. And most of good ICO in the past months really gave investors big income.
ICO is ofcourse a good investment but should be done carefully as market holding of that ICO and its project utility these are important to study. Reading whitepaper before investment is very necessary. If ICO fits then it will give good returns.