Is there any precedent of someone proving fraudulent concealment based on a confusing UX?

I believe so, but I know various SaaS’s cancellation UX’s have been litigated.

It's not about logic or even law. Suing a giant like Google implies a base cost in legal fees that is simply not an option for most regular companies. They'll draw you out in procedure way before you can see a juge, let alone plead your case.

Global corporations are in a league of their own.