Does it? Various user-blaming shenanigans, when Apple messes up their HW design can serve as an example. "You're holding it wrong", "You're putting the phone in your pocket", "You're using keyboard wrong in a real world with dust and stuff", etc.
Nothing prevent Microsoft to sells Windows Home/Pro as beta version of Enterprise and gets money & free QA.
If you pays money nothing guarantee your personal data will be used too.
You can of course sniff your network traffic to see what does get collected, and that way you at least know what they collected and you can imagine how it can be used and abused.
I don't see why they can't make some extra by making you the product as well.
Also, people who are into Apple are known to be willing to pay for stuff. A very lucrative group for everyone.
And if it leaked, Apple would be in very deep doo-doo with easily the largest class action the company has ever been hit with. It would be an unacceptable risk to even contemplate such a stupid idea. All for what, a few extra pennies?
Adobe is making money from selling software. They also make money from their telemetry system.
etc...
Google is an advertisement platform so they are the most experienced in using and selling your data (indirectly).
Microsoft is moving heavily in the SaaS direction with an insane amount of telemetry going out towards their servers from Windows 10. (If you have any concern for your privacy you will have to either disable that via powershell or 3rd party scripts/applications and verify that after every update it is still disabled.)
Facebook is infamous for their facebook pixel, they're looked upon as invading the privacy of everyone in multiple ways. So they're rightfully looked upon as an evil. They've sold and continu to sell private data directly and indirectly, including people who are not on their platform.
Finally Apple doesn't make their money using your private data (at least not on the same scale as those other companies mentioned). So you can view them as the least evil, at least when it comes to private data.
The other main use of telemetry is to power active threat protection. Having it turned on on more machines makes everyone safer.