Yes, moomoo is a legit stock trading platform that offers access to commission-free stock and ETF trading, as well as low-cost options trading. moomoo is a FINRA-regulated platform, and is insured by both the FDIC and SIPC for your cash and other assets on the platform.
Admittedly, moomoo is a weird name, but it is a trustworthy platform that supports millions of users in the U.S.