If there was just one quasi-monopoly it would have probably supported the bill. As it is, the market leaders have the competition from each other to worry about. Getting rid of open models wouldn't let them raise their prices much.
Actually, wait, if Grok is losing to GPT, why would Musk care about Llama more than Altman? Llama hurts his competitor...
Should we crown one the king?
Or perhaps it is better to let them compete?
Perhaps advanced AI capability will motivate advanced AI safety capability?