Bitcoin & co. are digital money not controlled by a bank or a state. There's no company behind it with revenue or profit, the value comes purely from supply and demand.
Bitcoin fluctuates many times more strongly than stocks or ETFs, there's no company behind it with revenue or profit. The chart alongside shows the real, current price history, the swings up and down are deliberately not smoothed out.
If you speculate with cryptocurrencies, only do it with money whose total loss you could handle, never with your emergency fund or your pension savings.