No they're not. It's an epoxy resin, not plastic. It's BPA.

So, a plastic then?

Edit after light scolding by commenter below:

BPA is a form of plastic, both in the pedantic sense (it's formed ... plastically... into its product shape) but more importantly in the colloquial sense, "synthetic, plasticky material" and in this general thread "synthetic material with harmful effects on health, probably through hormonal disruption".

So, yes, BPA is a resin, it's also a plastic, and it's also probably pretty bad, healthwise.

Is it?

[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...

[1] https://www.healthline.com/nutrition/what-is-bpa#basics

BPA is not a plastic. BPA is not a resin.

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.

I think they're talking about McDonalds which uses stainless steel tanks for delivery. I'm pretty sure those aren't lined with plastic.

I would think if they had meant "stainless steel" they would have said so, rather than "aluminum".

The cup linings and soda dispenser hoses and miles of water supply lines to the store your house and everywhere typically are.

And for decades it was full of BPA, AFAIK it still is ('stable' one, if you believe them...)

Obligatory link: https://www.youtube.com/watch?v=hUhisi2FBuw

aluminum may be toxic too.