If I did install an app from Google or Facebook, and it siphoned my personal data and sent it home to their servers in a way I found surprising, yes I would feel like it was spyware. Yes, this has happened to me and it made me angry.

However, I'm sure there are far more rigorous definitions of spyware and you should probably go with one of those in formal writing. I know it when I see it, but I'll let the experts define it.