I believe pocket and especially sync do nothing if you don't use them. This is in absolute contrast with Chrome that ties your whole navigator to your google account if you ever log on gmail...
Pocket link recommendations appear on the new tab page on new installs. You can turn them off, but they are there by default. Additionally the Pocket button persists in the address bar, but is also removable. It's indeed minuscule in comparison with what Chrome does.
