I doubt the vast majority of those of us using iPhones now would bother challenging it though. It’s often about what offers carriers are providing and I personally think people would just get what was easiest. If Apple pulled their iPhones from the UK market it would cause uproar amongst some, but I can’t see it forcing a tech revolution here. It would ultimately harm Apple more than the consumer because it’s not like there are not options other than the iPhone. The UK used to be Europe’s largest iPhone market (might still be), but even then Android is still very popular overall.
People on this forum often say ‘Apple should just pull out of that country’ without really thinking about the impact from a business perspective. Apple is wealthy but the billions they get from the UK still count.