>China makes consumer masks, profiting off pandemic they causes.
While I'm sure they would if they could there are problems with your analysis.
Firstly, China in March, knowingly shipped out defective medical gear. Importers are Leary of getting burned again.
Second, China has locked down 100M people in North West China due to new outbreak, and are restricting Med exports.
Thirdly, India is a big player in Med products, and US firms source much from India.
Finally, many US firms have entered the market, like My PILLOW.