While I believe the article is biased, but I think this point is true. I personally can't invest in any stock because it requires a lot of things, unlike crypto where we can only do simple KYC or even go anonymous and buy tokens/coins that we believe will grow in time. But it seems some exchange are trying to improve this condition, like DX.Exchange who provide tokenized stocks (but the exchange is buggy af).
It's insanely easy to buy into stocks/etfs/options, etc. If we look at Robinhood for example, which is the most popular stock trading platform for average joes, it's just a matter of completing a registrations process, deposit money, and ready you are. It's just as easy as investing in crypto, or even easier in some cases.
Nowadays there are plenty of brokers that allow you to trade basically anything, and people seem to love it. Crypto appeals more to people because it pumps harder, that's all.