My cat also likes to lick plastic, but they're plastic containers. No idea why.

Copying humans, they feel they need more microplastics

I cat sat once for a friend who had a plastic goblin. I spent the entire two weeks obsessively checking that I didn't leave any plastic out only to (occasionally) find the cat happily chewing on something that I didn't think they would find.

I learned my lesson about the depths of feline creativity lol and I was thankful they didn't get into anything that hurt them