Think of it this way as well, Robinhood's chief regulatory officer quits and gets hired as head of the SEC. Works as head of the SEC for a few years. Their tenure at the SEC ends and they jump right back to Robinhood.
I have 0 doubt in my mind, anyone in that position wouldn't already be predisposed to believe that actions (regulations, enforcement etc) that help Robinhood (and other trading platforms) are a good thing and will work for those corporate interests because they share the same beliefs by default.
Then, once they leave the SEC, they're welcomed back with massive pay as a thank you for the job they did pushing Robinhood's agenda forward which is at odds with good governance principles.
Its like making the head of Exon the head of the govt's renewable energy initiatives. They're gonna say increasing renewable energy output isn't a worthwhile pursuit, what we really need is more oil. Let's sign a big contract over with exon, I even know the people who work there and can make it happen!
Working against society's interests in favor of the corporations