Correct.
See how they just want you to sign in right when you launch the browser?
They want all your browsing habits to sell it to advertisers.
another reason why we should switch to firefox.
all free Google services come at the cost of your privacy. Android is another example.
why android? just change to a custom rom
That's correct, but it is out of most people's grasp. Only tech-savvy poeple can go for it.
One example of privacy breach: iOS gives you option to control permissions on app-basis, manually. YOU can control what permissions an app uses.
On Android, it is hard-coded. Android will show you what permissions an app uses and you can decide whether to install the app or not. But you can't control the permission set. Custom ROMs like Carbon ROM (https://carbonrom.org/) gives you this ability.
Oh okay, I see what you mean,
Cyanogenmod 11 has that as well. It's called Privacy Guard: http://hub.cm/blog/cm-feature-highlight-privacy-guard