Obviously because both of them are not the same. Cryptos are currencies while stocks are from big companies however many people crypto people compare crypto with stocks or vice versa. Cryptos and forex in one roof could be more possible because both of them are currencies.

I heard etoro supports cryptos now but etoro also have forex and stocks. Why won't you try them out? They are also reputable among the others out there. Of course, it's not stupid if you are a crypto investor and then you want to invest in stocks as well. You can even expand your investing business to other assets. The more the merrier. It's called diversifying and it allows us to cut risk or even earn more.