It's nasty when large corporations sell your data. But they do it anyway. And often they provide services we want to use!
My contention is that the grand majority of internet users do not have access to the information they need to decide whether a (otherwise free) service is worth giving up their data.
But there is good news! Resources for protecting your privacy are constantly improving. The list below is a "starter kit" for people interested in preserving their data without compromising their browsing