There is no law regulating who someone can sell something, assuming it’s not regulated goods aka drugs, guns. AI companies just outbid everyone else by a big enough margin and there are less than a handful of companies producing RAM as it’s rather complicated and specific production process. New producers cant easily enter the market due to the complexity and completely insane initial investment cost in setting up the production and they would have to design their own RAM chips as well, which would take years if not decades. Current chip producers don’t want to increase production either due to liking high price and being afraid of the bubble popping. Even if there is some legal grounds for government stepping in and regulating supply to avoid collapse of smaller companies who can’t outbid AI companies. They are dining and getting funded by the same AI companies.