To the extent that they're advertising - or even just increasing the availability of - derivatives trading to unsophisticated retail investors, I agree with you

To the extent that they're advertising - or even just increasing the availability of - derivatives trading to unsophisticated retail investors, I agree with you. But taking unlevered long positions in individual stocks is not that much worse than investing in ETFs, and saving money to take unlevered long positions in individual stocks, for someone who would otherwise not be saving much money (and who might otherwise be literally playing the lottery with that money) is often a drastic improvement. After all, it's just as hard to underperform the market by picking stocks as it is to outperform it; while the risk-adjusted expected return is worse due to the lack of diversification, the non-risk-adjusted expected return those traders will get will equal the market return, with some degenerate exceptions like Hertz.