What are the Disadvantages of Robo Advisors?

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Robo advisor is an algorithm-based digital platform that can help investors with financial planning automatically, according to the investor's risk profile over time. Robo advisors can also analyze profit, risk, liquidity and investment portfolio adjustments. Previously you had to answer several questions from the Robo Advisor. There are some of the best Robo Advisors like SoFi Automated Investing, Vanguard Digital Advisor, Betterment etc. But it would be good if investors also knew what the shortcomings of robo advisors are.