[bjpbakker]

That _long_ list is limited to the "basic level" telemetry data and does not include e.g. automatic sample documents that Defender sends by default (those include you actual documents).

Microsoft proves over and over again that they are not trust worthy. I agree you shouldn't be using their OS, but sadly many people don't consider this a choice since it comes pre-installed on most PCs.

[ChrisSD]

As far as I'm aware Defender will not send documents without prompting you first.