I don't see how that is relevant though. Tesla promised every car would have the required hardware for FSD, regardless of whether you paid for FSD upfront or no

I don't see how that is relevant though. Tesla promised every car would have the required hardware for FSD, regardless of whether you paid for FSD upfront or not. The fact that you have to upgrade in order to subscribe to FSD shows that they were wrong about that. They should honor their commitment by upgrading everyone to hardware that is capable of FSD, since that's what they were promised at purchase time.