Spyware is a file-based threat that has been around since 1996: spyware. Consumer or commercial spyware has gone mainstream, and the surprising number of software designed, openly marketed, and used for spying on people is proof of that. It can also be placed in the hands of stalkers, abusive partners, or someone who just wants to get a leg up in the divorce proceedings. Some well-intentioned individuals see the good in planting and using spyware in the devices of their loved ones.”]
Source: https://blog.malwarebytes.com/cybercrime/2018/09/when-spyware-goes-mainstream/