You either do not understand or trying to avoid the question
Is there a TurnMeToThePolice app for linux or windows ? and who installs it for free ?
For server side makes 100% sense , I use Facebook,Gmail, Dropbox for free so I expect they will scan shit for stuff. For sharing files I am also expect that cloud providers will also scan and respond for copyright violation, makes sense , for stuff you post on Facebook I also expect they scan for porn or other stuff that is against their TOS.
But it would be retarded to install something to scan my local files and report me to the police if I had nothing t6o gain from it , so you have already the iPhone, you paid for it, if Apple wants you to allow them to install this shit you should think, why? what I have to gain? Do I trust Apple and my government, what about the future government and the future Apple? The equation is that you gain nothing and the future is unclear so it is 100% a FACT that is a net negative for the user.
Still nobody found an answer why Apple did not scan iCloud for CSAM? And why are they starting now with this "think different" way of doing it. If you are a think of the children person you should denounce the fact they did nothing so far , if you are a privacy kind of person you should ask why Apple is giving up now on privacy.