Apple Inc.’s tensions with the UK over encryption finally reached breaking point last week. Rather than submit to the government’s demands to create a backdoor to customer data, the iPhone maker instead killed end-to-end encryption for all British customers of iCloud. It's a principled gamble that seems to rely on public outrage, but Apple may discover that privacy matters more in marketing than in reality for its customers.For those unfamiliar, data that is end-to-end encrypted can’t be accesse...