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For my homework.
I'm a college student and started learning about cyber security three months ago, I am going to make a slide to explain what is spyware with real-world examples/events.
AFAIK spyware is a software installed without knowledge and agreement, and able to access data without user consent., if I'm correct.
Therefore I do think XZ backdoor could be use as an example of spyware, but I'm not sure.