A single corporation owns the proprietary OS running what must be upwards of 80% of the world's corporate and government workstations that is known to be laden with copious amounts of telemetry and privacy invading logging is probably quite an attractive partner to the various TLOs of the US government.
I read some fan-fic conspiracy theory that MS is actually a facade for an intelligence agency a couple of decades ago. Getting less and less certain about the weight of "theory" these days.