I am not surprised that Microsoft is going as far as inserting ads right inside Windows file explorer. All the contrary, I wonder what took them so long.

I think it would make sense to insert ads during a long copy/file. After all, Microsoft lacks any ethics, why should they put a limit to it ?

These are not necessarily personalized ads by the way. So it's unclear whether governments out there could sue Microsoft with this alone.

The intention is clear though, utter disrespect for users.