It is crystal clear that Robinhood restricted trading in response to a $3 billion margin call from the NSCC. Multiple documents, statements and contemporaneous communications confirm this. fortune.com/2021/02/02/robin…
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Here is the email from 5:11 AM ET on January 28th alerting Robinhood to the $3 billion margin call.

10:12 PM · Sep 30, 2021

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Robinhood’s CEO testified under oath that the $3 billion margin call “exceeded the amount of net capital at Robinhood Securities” and that led to it imposing trading restrictions.
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Robinhood’s President & COO submitted a sworn declaration in federal court that the trading restrictions were “a way to mitigate the sudden increase in the NSCC deposit requirements.”
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The DTCC, the parent company of the NSCC, corroborated Robinhood’s statements regarding the margin call in a letter to Representative McHenry.
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Replying to @citsecurities
Someone needs to margain call your twitter account.
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Replying to @citsecurities
Which was it? The 27th or the 28th? Also looks from your chat log like your man "agreed" to mark securities as PCO doesn't it?
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Replying to @citsecurities
Blocking my tweets like you blocked the buy button
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