Assuming you're correct and this behaviour is illegal, who could the SEC prosecute? The ultimate instigator, u/deepfuckingvalue, posts nothing but screenshots

Assuming you're correct and this behaviour is illegal, who could the SEC prosecute? The ultimate instigator, u/deepfuckingvalue, posts nothing but screenshots showing his position, without further comment. There don't appear to be any specific organizers within the group, and many posters claim that they are buying simply because they "like the stock." That would be a risible position for an institutional investor, but as these are individual retail investors it seems like it would be tricky to prove malfeasance.