Too much power in one hand. And Apple isn't here necessarily evil but the high grade of automation.

Initially just a changed number and nothing more than a glitch to fix? The consequences show that we should as customers never built solely on one {manufacturer, provider, device, service} and must keep our data local - at all time.

It just a phone or computer which you own. Just use email and stuff somewhere else. And don't use their cards or financial services. Amazon credit cards are for the same reason problematic. One mishap during a return and you're in big trouble.

PS: I'm afraid that Apple will likely argue that you don't own your Mac.