Doesn’t really matter surely, you only need to trust the identity provider not to leak your identity and your porn provider not to have a key that your identity provider can link to.

You don't trust people who run a massive-scale streaming video platform to have the technical chops to generate random numbers?

I trust them to have the capability to do it. I don't trust them to be willing to do it despite legal duress (which is only ever a law-change away).