Because usually, financial advisors represent companies, you will most likely be directed to choose investment options such as insurance, savings insurance, deposits, mutual funds, and others owned / offered by companies or banks.
There is nothing like that in cryptocurrencies, you need to understand that you're stepping in a market that is mostly unregulated and you are completely responsible for what happens with your money, if you lose your money to a scammer you are never going to see that money again no one is going to ever insurance you for such a risky investment, that is why you need to think twice before investing in any coin.
This. Which in essence, was the original utility for 'cryptocurrencies'. When you decentralize, you lose or gain security depending on how you want to look at it. In this case, you are foregoing the protection of your assets by companies/government when you invest in crypto. However the stock market is volatile too and none of the above options really offer guaranteed ROI.