Well, we are discussing market manipulation. Which can be considered a conspiracy crime, right?
I think you've gotta take selection effects into account. The deep comments section of the Nth Robinhood/Gamestop post is going to be disproportionately full of people who are unhappy with Robinhood and willing to believe lots of nasty things about them.
Which then has a spiraling effect in that other disaffected people will read those comments and believe what they want to believe. Similar to the conspiracy theories in the election. However I do think there has been some super shady stuff done with robinhood that doesn't take that much to believe that there is a conspiracy/collusion is at play. It's hard to believe that they are altruistically de-risking their clients when they sell doge coin.