This has very little to do with HFT. I would argue that the person who wrote this Twitter thread really quickly veers off into the territory of just-plain-wrong

This has very little to do with HFT. I would argue that the person who wrote this Twitter thread really quickly veers off into the territory of just-plain-wrong. What's more likely, - Citadel is paying multiple billions to get in on a firm that's so talented that they managed to take on this GME position, or - Citadel is a market maker that has written a shitload of near-naked call options and now needs to deliver on them? HFT is not the root of all evil. Citadel isn't making a killing off of frontrunning retail investors that have a Robinhood account containing $137. Odds are pretty damn good that they're in hot water with an options position and need to ensure that Melvin stays afloat to try and keep as many contract OTM as they can.