What do we do with this?
Almost nothing. We don't sell, rent, loan or give your info to anyone else (not
even anonymized, aggregated or otherwise processed.) You're the customer, not
the product.
At signup: We want to confirm you're a real person. Contact
info is easier than asking for a blood sample.
After signup: We may contact you in case of problems with your account (like a mail loop, or we suspect someone is trying to gain unauthorized access). It's a secondary confirmation method in case you lose access to your account. If you send a payment by check and forget to write your account ID down, we use it to make matches.
Business planning: to see what countries our customers live in