Or are they mostly shitcoins, disappear or using your emails for phishing?
Have you ever participate to one with high profit? How long was wait for that?
I think most of them are just bullshit and time wasting and not worth putting some effort in.
Will in my own perception bounty and airdrops are very useful and profitable,but due to the consecutive down of market price this year the momentum of this kind of campaign will constant afected due to many rampant fake ICO project who coming out in the market now,actualy about bounty campaign is much trusted than joining airdrops because mostly airdrops now are not truly of what there promise to the participants and if even they give the airdrops token,this is not enough to trade because its low percentage volume of coins.