If we're being pedantic, the user still has to perform the final action before the install begins. I think it' more "Google has to allow you to install apps on your phone"

And they've never allowed the users to uninstall certain apps.

(interestingly the keyboard app is not among these, so my sister has uninstalled it by mistake once)

You mean "Google has to perform final action after user petitions it to install"

(not really final, Google can uninstall your apps anytime if they are deemed undesirable)