No, a lot will default to that, but they can’t force you to use any particular dns server. I mean they can, buts a fcc violation at that point I believe
…no, it didn’t. ISPs can’t just block access to specific dns servers Willy nilly. They can slow down specific dns servers of their choice but there’s literally no incentive to do so. Your individual dns traffic isn’t that important I promise.
They do worse than block it, the redirect it to their own servers.
And the data is worth it at volume. They have hundreds of thousands of users, along with the region they are in, as well as data on what websites they visit.
Advertisers have and continue to pay for that data.
I always thought they exist because privacy. Regular old DNS requests are not encrypted so even if you send a request to 9.9.9.9 your ISP can still see it.
They could technically just drop and traffic over port 53 that is not destined to their own DNS servers. But that's china level shit. I've never seen an ISP control this in North America.
They can also redirect that traffic to their own DNS servers, so you think you are using 3rd party DNS, when you are actually still using theirs. This became legal when the Trump administration got rid of net neutrality legislation.
TLS doesn’t encrypt the host name of the urls you are visiting and DNS traffic is insanely easy to sniff even if you aren’t using your ISPs service.