There’s a whole class of persistent organic pollutants that probably fit that bill. Plastics manufacture can involve BPA and phthalates; things like PCBs / PBBs occur in a surprising range of places like transformers and capacitors, fire retardants and carbonless copy paper; dioxins form in a bunch of processes and are toxic in frighteningly small doses, and the latest to join the club are the PFAs, which are involved in firefighting foams ans surfactants, or the preparation of water repellent treatments and non-stick coatings. Many are implicated in cancers and endocrine disruption, and may bioaccumulate to significant levels even in people with low exposure. The book Slow Death by Rubber Duck (2011) was a pretty thorough introduction to the subject - although I imagine by now many of its references will be out of date by now.
“Number of competitors in that space” is not unrelated to “and still get away with it.” If this (monopolistic) behaviour could be corrected by competition, why hasn’t competition with Apple corrected it?
https://www.theguardian.com/world/2011/jan/23/lethal-injecti...