By Redditors who have wasted money following investment advice from other Redditors, yes. Specifically it's claimed that after Citadel gave a failing hedge fund

By Redditors who have wasted money following investment advice from other Redditors, yes. Specifically it's claimed that after Citadel gave a failing hedge fund lots of money to exit their position, the hedge fund lied about exiting its position and actually didn't start exiting its position until a different division of Citadel asked Robinhood to stop GME buys the following day. Focus on Yellen's speaking fee is simply trying to explain away in advance why many people given access to data which could prove it either way and tasked with investigating will conclude this baseless conspiracy theory is a baseless conspiracy theory.