@mode13h @akien @Emi I think the issue is distrust. Someone brought up that the installation fee is really per "installation", not per "purchase", so if I buy a game, then reinstall it three 3, I just cost the developer 60 cents. This could be used for malicious intents (there's people out there).
Furthermore, someone raised the flag that this sounds like Unity is implementing spyware in games without developer's consent (or end-users).
@TheMarshmallowBear @akien @Emi Unity has clarified this point, only single purchase are counted (multiple installs of the same don't sum up).
Spyware? It they would be using some kind of DRM it would be only reasonable. We are all protesting about it (i.e. DRM) since... ever! :D