I’m not a lawyer, but I do know how computers work. I’d bet the farm on the very safe assumption that any protocol change that blocks a third-party client at the very least can plausibly be claimed to be in service of security, and most likely be a legitimate claim in reality. It is probably being downvoted because it’s incredibly far-fetched.

I agree that this would be their argument. But as other commenters mention, this area could be a minefield for Apple due to their dominance in various markets. It's possible they wouldn't want to get sucked into a lawsuit about this, even if they thought they could win, since they might end up making statements that would have a larger detrimental effects in other cases/potential cases.

I think most or all states recognize that the defendant’s actions must not be justified or privileged. It’s hard to imagine how Beeper would meet that element on these facts.