People don't fear this at all. They have their iphones, imessage, apple tv, apple pay. The only thing apple is missing is a social network (AFAIK they don't have one).
Apple makes a big point of highlighting their privacy features and pushing back against some government requests for exactly this reason; to allay fears about consolidation and overreach. I doubt Tim Cook is a passionate believer in privacy as a human right, but it's effective messaging so he pushes it.
Musk's approach is the polar opposite from Apple. A capricious and petulant owner who goes out of his way to appease racists and dictators is not someone most people are comfortable with handing a lot of control and information about their lives to.
> I doubt Tim Cook is a passionate believer in privacy as a human right
What makes you think this? Lots of tech people have this perspective, and lots of gay people understand this perspective at a very deep level (especially if older)
Tim Cook believes in all sorts of things....when he in the US/EU.
When he's sucking up to China, all the morals and values he ingrained by growing up a gay man in the American deep South quickly and rather conveniently go right out the window.
The market share of the iphone is about 20%. So I think your comparison falls short with the very first item.
I am okay, to be totally vendor locked in the apple-ecosystem, because Androids market share is so much higher. If the iPhone fails to be a good product I will just switch.
I am okay, to be totally vendor locked in gcp, because aws is a thing...