First, there are lots of smartphones that are not owned by Google or Apple, but for example by Motorola, Xiaomi or Samsung.
There is a difference between building something and owning it : my desktop computer is built by ASUS, but owned by FreeBSD - that is by me: I can (and do) change it any way I want.
Those smartphones You mention, they might be created on whatever mutual deal beween the manufacturer and Google, but they are certainly owned by Google: they need a Google-login to operate, they get all their software from Google, and they talk persistently to Google. And they cannot be modified by the operator (except changing the color of the wallpaper etc).
If You don't immediately get the point, think of a house: are you able to tear it down, build it up differently and then still use it as your house? Then you own it.
Second, if
you think the sole purpose of a smartphone is for Google and Apple to spy on you, then you are non compos mentis.
Nope. Anybody who runs a so-called "app" on your smartphone can spy on you. They run
their code at
their discretion on the device
you carry around, and you have no say in it beyond acception.
There is no validateable separation of concerns, and history has proven: if it can be done, it will be done (see my footer).
Why, do You think, does every goddam supermarket want to run an "app" on that device?
Old German saying: "Wie man in den Wald hineinruft, so schallt es heraus", or "as one shouts into the forest, so it echoes back".
In fact I am angry!
Have you all forgotten that it is
we who have built all these things? And now we have to crawl like slaves before google, crawl before facebook, crawl before whoever now think they posses the Internet, in order to get admission!?!