I've seen the opposite of this at a startup once in the streaming music industry. We _knew_ our "free trial for a month" was being abused by 500k+ users because the sign-up flow neither required a valid payment on file or email validation. In fact there was an entire industry built around generating false throw-away accounts.

The company used stats including non-paying users to demonstrate demand for our service was high, even though we knew they would highly likely never spend a cent with us.