1. Given the US track record, yea. Sounds like US is going all-in on banning everything.
2. The difference between China and the US in these fields is actually in favor of China, in my opinion. The US is behind, so if they do ban Quantum Computing and AI, China will find themselves even further ahead.
The overall gist of the US actions right now is to completely split the world in two, one US-focused and one China-focused. The US is trying (hoping?) the rest of the world will fall into the US camp and they're doing it through threats and violence, but I think they're finding the rest of the world would rather leave the US camp.