Need cryptocurrency like Bitcoin, Ethereum, Dogecoin and so on.
You can join coinbase, and also get rewards in cryptocurrency, like in Stellar Lumens, Compound, The Graph and many more. If you use this link, you will get about $10 in Bitcoins after trading for about $100. Whats not to like?
Some are using cryptocurrency as an investment, some not to have them in a normal bank, and some are just paying for strange stuff with it.