Sure. Robinhood got a call from someone very powerful in their circle, politely asking them to stop the amateur plebes from interfering with their professional market manipulation. We are taking about people commanding titanic amounts of capital and (indirect) regulatory power. Robinhood then had the choice, do we make enemies out of these people or do we just screw, er, I mean protect, our customers? Unburdened by a…
While what you say is plausible, can't it also simply be that they saw a gigantic portion of their userbase making these incredibly risky bets and they were worried that it'd end up blowing in their face?
This is some anticompetitive bullshit, plain and simple.