My wife hit this the other day. She entered her info on a website, gave up, and then got a polite email from them, something like: "Hey, we noticed you started

My wife hit this the other day. She entered her info on a website, gave up, and then got a polite email from them, something like: "Hey, we noticed you started filling in our form but didn't complete it, are you sure you don't want to sign up with us". She was furious, and we wrote a reply saying how unethical we thought this was. It was a small business (swim school I think).