Investing on ICO:
Investing on ICos are totally risky and you never know you will make profits or even your capital amount until the project gets listed on exchanges if that not happen then your capital amount will be lost of the useless tokens and also the scam rate has been increased so you have tough task to find the legit among the scams.

Trading:
Less risky when compared to ICO investment but still there is no fixed earning here and the market is very bearish for long time so making profits will be tough task.

Airdrops and bounty programs:
No risk because you don't need any capital for doing this but 9 out of 10 bounties are not worth to participate so all your effort may end in vain most of the times.