I could never sign up for Mint. I see the value in it, but providing a private business with a view into all my financial accounts just seems like a huge mistake.
Other than banks, creditors, and credit-score companies? I imagine there are far more businesses with access to view our financial accounts than we realize day-to-day.
It's not just that, but they use information in your accounts to recommend other companies' products. Today I got a notification that I was paying more than average for car insurance, with a link to a competing product.