Remember, kids:
It’s not “vegan wool”, it’s plastic.
It’s not “vegan leather”, it’s plastic.
It’s not “vegan fur”, it’s fucking plastic. It’s all plastic.
It’s all fucking plastic, and every time you wash it, or damage it, or try to dispose of it, that plastic winds up in the water, in the earth, in the air.
Hell, half the damage is already done when the fucking things are made. As the OP says, it’s all oil and oil products; it creates pollution just to produce synthetic fabrics and materials, even before you try to throw them away, which, I mean, good luck with that.
A lot of vegan ideology is built up around a very superficial set of ethics that are supposedly about protecting animals, wildlife and the environment, but they fall apart when you look even a little bit below the surface. Every time you eschew an animal-based product in favour of something “synthetic” for the sake of “saving an animal’s life”, you’re creating pollution and trash that won’t go away for thousands of years, damaging the Earth and making life so much worse for countless animals and people.
Think about this stuff more than not at all, please.