In this case, I will tell you that if someone wants to earn in cryptocurrency and that too without investment, then I will advise him that first he should collect information about cryptocurrency and then After that, my advice is that different type of work in cryptocurrency like airdrops Which are without investment, they are absolutely free, so they are campaigns in bounties, where you do not need to invest and you do it for free. I would say that he should do them and earn well, and everyone can earn well in this way, but here the only condition is that he should work hard and get his profit.