From what I read, things are being deleted for all Library folders ie: Documents, Downloads, Music, Videos and Pictures folders.
See, this is the thing. MS has got people by the short n' curlies with Win 10 and is treating users with the utmost disdain and disrespect because it thinks it can, believing it has the only universally viable OS on the planet. And sadly, given the limitations of Linux, the walled garden ecology of Apple's O-SX and the fact just about everything runs on Windows, that's rather close to the truth.
The question is, are these files being deleted or has MS taken it upon itself to move these files to the 'cloud'? And if they are being deleted, why? Is it because MS has flagged politically incorrect, anti-social key words or phrases? Or because it detected 'illegal' downloads, and as self-appointed downloads police, took it upon itself to delete the entire folder to be sure all illicit content is gone?
In any event, if any of this is true, and it could well be, MS has long overstepped the mark and become a tech bully resembling a totalitarian state with a ruthless dictator at its head. It is not MS's place to be a service provider and a policeman at the same time.
I had high hopes for MS and Windows when Satya Nadella took over as CEO, but those were dashed when MS became more secretive, heavy-handed and started forcing Win 10 down unwilling users throats. Like yeah, just when we thought Apple was bad, MS went one or three better and out-Appled Apple.