I think because stocks comes first before cryptocurrencies. With that, more people knew stocks than crpyto. Since we can also earn from stock, they already have spend a lot of time in studying on how to invest and earn from it. They become committed to stocks, they may have no time for crypto, they may see the higher risk from crypto and since they are already earning from stocks, there is no reason for them to find something new to earn.
I agree that those who are used to getting profit from stocks will find it difficult to switch to investing in crypto. Moreover, most of those who invest
in stocks are the old generation who are over 40 years old, and those who are old people find it difficult to understand new things. Moreover, crypto
has a very high risk, usually often avoided by older people. Most crypto investors in my opinion come from the millennial generation, who like
modern things and advanced technology. Even many of my family were not interested after I showed the profit I made from cryptocurrency,
because most people prefer low risk investments, such as gold and stocks.