Yes, this is what Amazon banned last year, seemingly in response to FDA overtures around wanting to reassess it for prescription status.
This may be the best advertisement yet as to NAC’s usefulness and effectiveness. If it might be bad for Big Pharma, they’re against it. One of the big lessons of Covid is that many (most?) politicians, the media, big public health (CDC, FDA, NIH) are all in the pocket of Big Pharma. This is a lesson in regulatory capture and beyond.