We know that four way to cryptocurrency income such as Invest ico, mining, trading and Airdrop-bounty. If you wish, you can do any of that.
If you want to mining or invest in ico and need a lot of money, it has cost-effective risks and have also profits. And if you want to do trading then you can start trading only if you have some money. Here's a little less risk and have also profit.
If you do not want to take a risk then you can start the bounty. There is no risk here only you will have to work on time and you will get your payment at the end of the job. As a payment, you can get cryptocurrency and convert them into meaning by selling them. So, I think Bounty and airdrop is very good for earning risk-free cryptocurrency profit.
Not just in crypto world but there is absolute zero places where there is "risk free profit" anywhere in the world. However the most sure fire thing you can hope to get is the %4 at freebitco.in website, that way your bitcoins will be going up and you will still make money if bitcoin price goes up as well. Normally if you are going to just hold any coin it is always wiser to make money from holding as well.
If you are going to trade and make money than there is no reason why you should try to get some on top of it but it is definetly a great approach if you are going to hold it. That is why I prefer places that is already known in the crypto space (don't fall to other business that tells you will get 50% a day or so they are scammers) and put my money there while I am waiting for the bull.