Usually if something is being eroded you check what chemicals the erosion releases. If you cook on a pan and you don't analyze the contents of the fumes you are totally responsible
The problem isn't that no one knew what's in the fumes and that those chemicals are being eaten/inhaled. It's that in laboratory testing they never showed any impact on humans - but scale it to few billion people and then you notice increased liver cancer rates.
The only good thing is that making non stick pans with this stuff has already been banned in US and EU for a good while.
