[0] Bisphenol A (BPA) is a chemical produced in large quantities for use primarily in the production of polycarbonate plastics.
Guess it is. Why is it a problem?
[1] Researchers have found that BPA exposure is linked to a number of health issues, partly because BPA mimics the structure and function of the hormone estrogen
Not to be wagging the finger, but instead of a snarky remark (ending in a question mark, so the reader can't conclude anything from it) a little Googling and posting a correction with the reasoning would be better.
[0] https://www.niehs.nih.gov/health/topics/agents/sya-bpa/index...
It is a precursor to resins and plastics, the same way that water is a precursor to sea water but is not the same thing, even though sea water is 96% water by weight.