I did this for a couple days when Comcast's DNS was fucking up when I moved into a new place and was stuck with their modem/router/AP for a bit (which was locked to like 6.6.6.6 or whatever it was).

Tried explaining it to several customer support techs but they all just gave up eventually.

Was fixed when I ended up getting my own modem and router/AP.

But those were an interesting few days. My partner was annoyed they couldn't use Pinterest but YouTube loaded fine. Google search worked but our local pizza joint's site didn't.