First of all ...
... don't give $BIGCO any real data. Lie wherever possible, and always pay cash. Use "found" club-cards wherever possible. You don't owe them your personal details.
Second of all, am I the only one who sees this "must collect any and all data" as the same syndrome that teenage boys have, that being "must save any porn I come in contact with"? The results seem to be the same ... Gut feeling is that the marketards running $BIGCO have never grown up, and have never figured out that "yesterday's porn has already been viewed" ... The world changes rapidly; last decade's data isn't just stale, it's decomposing.
That said, I personally, have nearly four decades of my personal data archived. It's very, very rare that I find anything over a couple years old useful.
Just something for the marketards of the world to chew over.
 I've been unclogging dorm-room computers since before the IBM 5150 existed.
 Pictures, music and bits of source code excepted, of course.
 No, not those pictures. Personally relevant pictures.