I don't think it's just Americans, and in the case you cite, people were completely justified in their skepticism. The reddit account was apparently created for

I don't think it's just Americans, and in the case you cite, people were completely justified in their skepticism. The reddit account was apparently created for that single AMA post and had no activity before or since. The company he allegedly went to, Beike Biotech, was notorious at the time for using various forms of astroturf and deceptive advertising to promote its unproven stem cell treatments by testimonial, a problem that is rife in stem cell marketing. The Chinese government ended up cracking down on domestic cell therapy clinics in 2015 after years of ineffective enfprcement measures, which would be a very unlikely thing to do if it had faith that local hopsitals had developed an effective treatment for spinal cord injury.