Spyware is one of today’s nastiest sources of data leakage, often in the most innocuous places. Alexa’s functionality is designed to help people measure how much traffic they get, but it can also be used by attackers. Google may use its spyware to create better link quality in its search engine. If you haven’t put in a policy to remove unnecessary toolbars from corporate laptops, there is no way to know how much data is leaking out your company — on every request.”]
Source: https://www.darkreading.com/attacks-breaches/spyware-hides-in-plain-sight