Basically, Microsoft spies on everyone. They'll identify you and let the feds trawl through your OneDrive account. On Windows, it actually takes a very conscious effort to NOT upload files to OneDrive.

They're targeting a guy just because he unknowingly interacted with the suspect. As a joke.

If anyone questions why people like me have a GrapheneOS pixel connecting to self-hosted cloud storage on a home linux server, this is why.