Just like on regular Windows 10, the Xbox One collects telemetry data too.

Most telemetry is collected when you activate "Extended usage data", for example when subscribed to the Insider program.

Deactive telemetry in Dev Mode

The following commands should disable most telemetry service. Unfortunately it needs to be executed on every bootup.

sc stop xbblackbox
sc stop etwuploaderservice
sc stop xbdiagservice
sc stop diagtrack