indeed, and he is being sued by the state regulator, which might be far worse than a SEC investigationFINRA and the SEC have reams of rules about licensed users trading, balance in statements, and approvals that may be required.
If it's a classic pump and dump, both his employer and he could have massive liability.

https://nypost.com/2021/02/17/roaring-kitty-keith-gill-defends-his-gamestop-posts-amid-lawsuit/