The more data you have out there, the more convincing an identity thief can be, and the more under the radar they can be before you realize that anything is wrong. Correlating seemingly disparate data is a key ingredient to effective identity theft.
As I mentioned in another reply, at some point MoviePass will come to terms with the fact that the big theater chains are not going to buy their data, so they'll have to sell it to someone. What if that someone is, say, the government? They don't have anything to sell you but they'd sure value personal data on the citizenry. I'm not a conspiracy theorist by any stretch of the imagination, but aside from not wanting my personal info and location history to be available to corporations, I especially don't want that info to be easily available to any government agency that wants it.
And spare me your 'If you have nothing to hide ...' arguments. Example. You live in California or Colorado and smoke a bit of weed. The feds decide to exercise their muscle and bust casual weed smokers under federal laws that (they think, or want to test) conflict with state laws. Do you want the government to know you've visited the dispensary down the street every Tuesday at 2 pm for the last two months?
This type of data collection and use isn't necessarily about what's happening here and now, but the climate of things in the future. There are states in the US that are very much (for example) anti-gay, anti-abortion, anti-whatever, and allowing rampant personal data collection, especially location and spending habits, give whatever oppressors there might be fuel for whatever lame-brained schemes they come up with.
It's not limited to governments, either. You could, say, be turned down for a job before you even interview with a place because of where you live, where you shop, what your hobbies are, etc., stuff that's nobody's business.
