Ah yes, let's let a potential deadly thing go on the "market" and just hope it works. Because every first responder is going to take time to read reviews and ensure they thing they are wearing is actually going to work.
Maybe you're a bit oblivious to the problem, but the US has 160,000 ventilators and 372 million people. Even if only 1% need a ventilator we're over 3 million short.
Do the math buddy, before you get snarky.