They are not reducing battery capacity. They are reducing usable capacity, which was never advertised to anybody. Having said that, if your range decreases by 30% from the advertised range when the car was new, then you have a legitimate battery warranty claim. It’s obvious that Tesla is reducing the max voltage on the cells for a legitimate concern (probably related to fires). I understand your frustration, but I’m not sure what exactly you would have them do. Replace everyone’s pack instead reducing max cell voltage? That’s not a realistic solution and is not a contractual obligation they have as long as they don’t continue to reduce the range so it hits the 30% warranty threshold. If people don’t want Tesla messing with their vehicle operation, then disconnect the vehicle from the internet and avoid the updates. Every Tesla owner knows that updates can increase or decrease performance. It’s part of the Tesla experience.