Not sure if it causes cancer or not, but this is like a security hole in the scientific process (ie mostly only the company that produces X will fund studies of X). It's interesting to think security holes more generally - Nick Szabo got me thinking along these lines with his recent pinned tweet: "Giant companies are the security holes of capitalism. The more centralized industries get, the more they attract socialist political activists. The Bolshevik Revolution was a violent version of this vs. railroad stations, newspapers, etc. Now activism is focused on tech giants."