Suddenlink does the same thing-ish. Sometimes I get a popup that says "service outage incoming at XXX" at the top of the page- I ended up figuring out there was a checkbox for that sorta stuff in the account options tab. Similarly, it redirects non-websites to their own search engine that never seems to go away. (ex: igrj.43 redirects to http://search.suddenlink.net/index.php?origURL=http%3A//igrj...) Again, not terrible, but really invasive to my mind.

As it stands, they're basically the only supplier near us (sub-rural texas), so I just got a VPN.