A number of advertisements have been spotted in Windows 11's Settings panel

 test builds of the operating system, which is a dismal trend for recent preview builds.

This was reported by a reputable source for Microsoft leaks on Twitter, Albacore, as noted by the German tech website

In a Windows 11 preview from the Canary channel (the earliest test builds), 

Albacore provided some screenshots of the new home page for the Settings app.

 The top of the panel in the first screen capture (on the left in the tweet above) has a Microsoft 365

advertisement that describes the service's benefits and lets consumers test it out for free (during a trial period).