In the last 20 years, Microsoft only paid for Dolby during 2009-2012 in Windows 7.
Microsoft didn't pay for Dolby in Windows XP, Windows Vista, Windows 8, Windows 8.1 and Windows 10.
So, it is not Microsoft that deserves the "blame". It is consumers who forgot that they indirectly paid for Dolby when they bought a DVD burner (which came bundled with windvd and dolby) during the XP era, skipped Vista, upgrade to 7 (and enjoyed the Dolby freebie from Microsoft), skipped 8/8.1, then entirely forgot that Dolby was a freebie Windows 7 exception when they upgrade to Windows 10.