Cool service. A concern is that scammers can use variations of the domain (chaseoptout.co optoutchase.com etc) and use adwords to get on top of search results to trick people and steal personal identifying information if this thing gets popular enough.
Well, its the same concern with any eCommerce website that takes your CC, or really, just about any website that has a form input field. Few people in my office click on pretty much any link random people email them. I've even told friends/co-workers to reset their PW because they've been breached based on HIBP, but people never seem to care unless they personally get affected. I've given up..
