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Samsung is planning a 400-500$ foldable for 2024
(mashable.com)
This is a most excellent place for technology news and articles.
There's a superthin glass under the layer of plastic, it's what cracks and breaks and gets all crunchy when you see broken ones with a rainbow in the middle. Jerryrigeverything has great teardown of em for how durable/fragile they really can be.
There is glass. Just very thin.
A 30 micron layer of "some SiO2 but mostly polycarbonate" is not what I'd call glass... But whatever makes Samsung investors sleep better at night, I guess.