Google indirectly, since it allows people who buy them new to resell them easily (and thus encourages them to buy new pixels).

That is an outside factor that isn’t a guaranteed outcome. Many people sell phones that they’re no longer interested in after trying them out.

Similarly, you using any Android phone with any Android ROM benefits Google indirectly, because it advertises their OS. And because it may support the development of AOSP, which of course is beneficial for Google.

Or you accessing any website that uses any google services for anything benefits Google indirectly, because it's traffic for them, even if no valuable data is gathered.

Virtually anything you do is likely to benefit mega corporations like Google. It's almost impossible to live a reasonably good life without benefitting them. It's about finding a balance and cutting their benefits to the point where they're unsustainable long-term.