It's not backed as you said, but have you seen its value? Since we are talking about investments or trading, Cryptocurrencies may not have an actual or physical form and yet they come along with their own value, much better it is quite higher than the usual stocks.

In reality, all of them plays within the market just different industry. Both industries are volatile, but we can say that the Crypto industry is much riskier than usual since the market itself is pretty much unstable. But the return is much higher than the usual stocks, so Higher risk - Higher return.

Well I guess OP, is still in the denial stage wherein he/she can accept the fact that Bitcoin and Crypto industry itself is valuable despite the lack of physical asset like what have said.