Oh yeah, those are all good reasons, and there's a bunch more too. It's legacy tech that is cheap, reliable, and independent, it works well anywhere that has limited scale and cares more about cost than video quality. For example :

* Some hospitals, for instance, still have entire wards using DVDs. Downtime in a room is many tens-of-thousands-of-dollars lost per hour. Outpatient medical settings often use them as well (pediatricians offices, dialysis clinics, etc)

* Some schools are still tied to the format, for multimedia installations / video carts / pre-purchased equipment / etc.

* Tens-of-thousands of minivans are sold with infotainment that's always 10 years behind modern tech. (For almost 10 years, you had to have a binder-full-of-DVDs to use any Chrysler Minivan's video player system, the only other option was the analog RCA ports next to a kids seat). My 2016 Minivan, for example, only supports DVDs and nothing else (even though both BluRay and HDMI had been common standards for 10+ years by that point)

* And of course, there's millions of homes that aren't bothering to upgrade. (Netflix still has something like 2+ million unique DVD-only subscribers each month)