Surprised me too...but they do...at least oil and filter...also...as you say, it gives the dealer an opportunity to "inspect" your car for "needed" repairs...and while some will try to upsell items UNneeded, believe me, most cars that come in to dealers need more than just an oil change...I did not know the dealer installed customer supplied parts. Most independent shops won't. Kinda like taking a steak to Outback and asking them to cook it for you. Few independent shops will change oil for $20 labor. Free or, cheap oil changes are loss leaders used to get you in the door and try and sell you all kinds of stuff you do not need.
The dealer I go to will inspect brakes, or give an alignment check, or the typical "21-point" courtesy check...last time I went with alignment; this time I went with brakes.