Earlier quoted context omitted.
I guarantee you the interests of institutions on the short side of the stock factored in to the decision to raise deposit requirements. And the Interactive Brokers chairman is explicit about why he chose to block buys.
> I guarantee you the interests of institutions on the short side of the stock factored in to the decision to raise deposit requirements. Is there any evidence for this, other than the general feeling of "rich people are powerful, therefore they must have been some meddling by them"? The formula for determining the deposit requirements is publicly documented: https://twitter.com/kralctrebor/status/1354952686165225478…
And it's an open secret that Wall Street institutions colluding / bending ethics and the law is basically business as usual. (In this particular case I talked to a couple people I know who work in market makers and hedge funds and they took it as given that the requirements would have been put in place to protect short selling institutions)