Yeah, you're right. I think this article lacks specifics, but they did mention capital requirements. I was referring to their previous blog entry: https://blog.robinhood.com/news/2021/1/28/keeping-customers-.... In addition, their founder @VLAD on Twitter cited misinformation as a reason.

As for conspiracy, I'd venture to guess that inconsistencies/hypocrisies and opacity turned people into cynics. I'm not saying RH is hypocritical, by the way. Instead, the hypocrisies of other platforms made people trust RH less. For instance, I saw numerous accusations that RH was helping wall street by limiting buying but not selling.