From kaspersky.co.uk
Stalkerware (aka spouseware, aka legal spyware) is openly distributed commercial software that allows the person who installs it to spy on the people on whose devices it ends up installed. And it’s a big problem – not only for the intended victims, but for security companies as well.
On a human level, stalkerware is very problematic. First and foremost, it’s a kind of technological abuse, which is unethical to say the least. In addition to that, the security risks stalkerware brings should concern everyone: victims and abusers alike. The malware can leak victims’ data and breach device protection, leaving the door open for malicious software of different kinds, and more.