Yes, can. Without investment you can also earn money in this crypto world. You can trade coins or tokens. So you can choose good and potential coins such as Bitcoin, Ethereum, RIpple, EOS, Litecoin and others. You can choose the one that you think is good. What is clear is that in trading you have to buy Coins when the price of coins is low, and when the price of coins rises, that's a good opportunity for you to sell at high prices. That's where you will benefit.