From just observation, Crypto is somehow new to the trading scene, and the volatility percentage of these coins is really fearsome.  Also, you can add the lack of education regarding cryptocurrency. Just engaging through crypto is scary, cause of the lack of knowledge we know before engaging.

On the other hand, in fiat trading; 1) it is much documented and many significant books regarding trading are referenced with fiat currencies, 2) fiat trading is already proven and experienced by different person throughout the age. 3) you can see the results of the stocks you bought, for example in Tesla, where you can see their progress, and it is documented in their site or even in news pages.