There's a difference between your OS spying on you vs. a website that you can choose not to use (and can easily limit the spying capabilities of) spying on you.

There's a difference between your OS spying on you vs. a website that you can choose not to use (and can easily limit the spying capabilities of) spying on you. Most people can't easily switch OSes. You can easily install uBlock or some other ad and tracking blocking addon to prevent Google and Facebook from spying on you.