Was it a happy-accident that glass drinking glasses have been in use for hundreds of years and they don’t leach any dangerous chemicals into their contents and thus into our bodies?
Did that lull us into false sense of security where we assume that drinking container vendors would only provide us with things that would not poison us?
I wonder if it was more that their ingredients are ‘all natural’, rather than the synthetic ones that are created through chemical processes.
(It’s true that heating sand, etc. is a chemical process, but a much simpler one than those used to create plastics.)