Most fast food restaurants and food processing plants. Hot dogs in the plastic casing as they are heated in the factory. Fast food (taco places have meat bags that they heat up before cutting open for use).

Maybe in a sous vide? But a separate issue will be already-quite-hot food being put into plastic. Think they let your takeout noodles/soup cool before putting it in a plastic container?

When you put hot food in it.

Baby bottles. We use a bottle warmer that heats the bottle with steam, but yeah, I'd say breast milk/formula counts. That being said, I don't think I've ever seen bottles not rated as being safe for bottle warmers? And you'd never put a bottle in a microwave (process is too harsh on breast milk and consequently ruins much of its nutritional value, not sure about formula).