Malwarebytes Anti-Malware has added Registry Cleaners and Driver Updaters behaving aggressively to its PUP classification. PUPs are listed as Potentially Unwanted Program makers, and other shady online marketers. We are not saying that all affiliate programs are bad, only that they are rife for abuse and that many of these programs are indeed abused. The larger the number of installs, the greater the chance that they will result in a purchase, or conversion, the PUP is a PUP.”]
Source: https://blog.malwarebytes.com/cybercrime/2015/07/pup-makers-digital-snake-oil-part-3/