Apple's "free" services are all dependent on you having bought apple products. When you buy a device, the "profit" on the hardware (the oft reference BoM only cost) also pays for the software development, the services, etc.
Claiming that anyone should be able to use those services because they're "free" is like saying anyone should be able to get free service at Toyota garages because Toyota does free service for people who bought a Toyota vehicle.
Personally, I think the answer is "no", we should not allow that sort of thing. Profit is not the most important thing in the world, by far.
Your car analogy falls flat, as is the case with most car analogies. No one would expect to get free service at any garage, and that is unrelated to the topic at hand. You can go to any garage, and they're mostly not model specific; even when they are, there are plenty of third-party alternatives. (And this is why locking down car hardware/software such that only the manufacturer can provide service is a garbage practice that we should legally disallow.)
Running a service costs money.
That money has to come from somewhere.
Google makes that money by spying on people and using that for ads.
Apple makes that money by selling hardware.
You're saying that both companies should be required to provide the services they render, but apple's model of paying for it by selling hardware should be banned.
Also, go talk to someone who has bought a new car, and ask them how much their servicing costs. If they go to their manufacturer's service centers the regular services are free for the first few years, but if they go to an unrelated mechanic it costs money.
For the same reason that if you buy a game for xbox, and then when you later buy a playstation you can't turn around and demand that MS port the various xbox services to the playstation, or a publisher port an xbox game to playstation.