Yes, plastic degrades mainly through oxidation, water, and UV exposure. The danger is that these kinds of things just embrittle the plastic, causing it to crack

Yes, plastic degrades mainly through oxidation, water, and UV exposure. The danger is that these kinds of things just embrittle the plastic, causing it to crack, flake and powder into smaller pieces ("chain scission"), which we believe are still endocrinologically significant. True biodegradation would mean the plastic is reduced to base chemicals like CO2.