You can lose all your money in the market playing around in the market. If I could sign some sort of statement saying I know what I'm doing, I won't invest more than I'm willing to lose, and while I may make extremely risky bets, I'm willing to forego your "protection" in favor of being able to lose all of my money, I would.
And I did, because I'm a registered investor. But this isn't available to most people, only the top 10%.
I agree with your skepticism of registered investor requirements, but that's not really a related issue. Regulators and platforms intervene in this way against even the most sophisticated investors; the possibility of a trading freeze when the market exhibits crazy volatility is well-known.
I can buy GameStop. My friend can't. Trading freeze for everyone, sure. Trading freeze for some people, but not for other people? That's fucking bullshit.
And I did, because I'm a registered investor. But this isn't available to most people, only the top 10%.