Performance: Ads are also problematic for performance in terms of bandwidth usage and CPU consumption, especially with mobile devices.Bad publicity has even affected important websites and major media such as the BBC and the New York Times. Security: The growth of malicious advertising is really alarming because your device can become infected simply by loading a page with ads, without the need to click! Ads can be used to serve malicious payloads that take advantage of security errors and can even take over your devices in exchange for a payment (ransomware).The ads are basically digital surveillance cameras that continuously abuse your Privacy. Depending on your user profile, they will show you ads directed through the advertising networks of the websites you visit. This tracking software embedded in the ads is used to build an intimate user profile that includes your interests, browsing activity, location, age, family members, friends and much more. Ads are usually served through third-party domains (advertising networks) and contain sophisticated tracking. Privacy: From the point of view of Privacy, online ads are horrible.