>AFAIK, you can change the DNS in your router to point to one that doesn't do the hijacking in most cases.

Unless the device bricks itself until you give it access to the vendor's own DNS server.

>My Chromecast Ultra would not start until I began answering 8.8.8.8

https://news.ycombinator.com/item?id=19170671

Now you can't use DNS restrictions to block on-device ads at all.