Involvement in the stock market provides a HUGE difference in flexibility, variability, and manipulations. Cryptocurrency is not yet as strong as the globalized market on stocks, as a large plethora of companies also rely some of their profitable side sources from their shares or proportions in the stock market. Accessibility is also very different in cryptocurrency, as it only involves mostly digital wallets.
I don't think it's not that strong, crypto market is already strong and there's already the support from different countries and as well as financial institutions.
But it's not just big yet as the stocks market. That's the thing that stocks does have right now and it's not as volatile as crypto but people are having more confidence of investing in cryptocurrencies as soon as they've understood it.