"In what specific way do you think that Windows 10 infringes the GDPR?"
No way to opt out of it while it does access personal information? The fact it can lift sensitive data? The ability to lift your files, for example, without asking you? Or the memory contents when the system crashes?
For example, for movies: URL for a specific two-second chunk of content if there is an error - they will know what movies you're watching - which can give away sensitive information (sexual, political, etc. preferences, health info)
For book: content type and size details - they'll know what you're reading.
"Pseudonymized" Browsing History data. Text typed in Address bar and Search box URLs (may include search terms) and page title - all of them can give away sensitive information.
Windows 10 is a privacy ticking bomb.