Interesting counter point to the "elites-pulling-levers-to-protect-hedgies" conspiracy theory: https://twitter.com/arampell/status/1354859474658312196?ref_...
That's not a counter point. The IB Chairman explicitly said they put in the restrictions to protect market makers rather than their customers: https://www.youtube.com/watch?v=7RH4XKP55fM
He is concerned that there is a $15 billion loss out there due to options on GME. This could wipe out the intermediates guaranteeing the trades. Further that $15 billion can grow arbitrarily as GME is in a short squeeze and disconnected from reality.
[0] - https://www.cmegroup.com/clearing/risk-management.html