Email scanning and file scanning (on our computer) became acceptable when the level of spam and malware became intolerable. But it was at cost of our privacy. Today, Gmail scans all your mails and makes money from it. Both Windows and macOS have built-in anti-virus or malware scanners, and file indexers, and thus know all the applications and files in your system (which provides for more data on your profile with them). Now with both OSes, and even browsers like Chrome and Firefox, including AI, they will now use our own computers to not only collect our personal data, but even process it on our system and use it to build even better profiles to more profitably exploit us.