Even Comcast has been known to inject ads. The core tenant of these VPN services is trust, with it they dont survive, but for an ISP with a de-facto monopoly thats a non factor. There are also plenty of sites and services that use IP tracking. Google is really bad but others are doing it behind the scenes and not telling you. Reddit 100% does. Amazon too. To the point that if i proxy my connection and try and login to one of my google accounts i sometimes have to verify or go through recovery.
So in some cases its better than no vpn. And I wouldn't use any authenticated service over tor that i wish to keep. There are so many malicious relays and exit nodes.
TOR is easily tracked at the nation-state level. China can axe tor traffic, even with bridges and OBFS4 configured.
With a service like nord, you can get on and do your thing to bypass the great wall for the most part. And the the great firewall drops that connection you have a very large pool to choose from for your next.
So there are definitely some reasons I could understand some would use them based on their own assessments/needs.