Bounty campaign only profitable in 2017 and in the beginning of 2018, and after that this job not really promising good reward because too many ICO that has low quality product. So ICO market turn in to low demand and the trend of crypto market also in bearish mode. Bounty campaign maybe profitable job again if the market back to bullish trend.
Almost all bounties on 2017 are really profitable, then when 2018 came up the good image of ICO was little by little damaged by those scam ico, were most of it turned into nothing til reached the last month of 2018, now when 2019 came up IEO rise up and became trending where most of the investors and bounty had finally found an alternative way to get profit and ICO also became good compared to 2018.