stackoverflow.com (actually, and through my ISP) points to 104.16.33.249 and that IP also shows my ISP's page - https://imgur.com/CgECUZR - so i don't think this is DNS hijacking; the DNS mapping is correct but the actual content has changed.
- I have paid the bills
- Clicking continue just goes into my ISP account panel and not to the actual site, so not really an "offer" popup or anything.
- Yes they definitely are. Most of the "my Internet" now points to their servers. I have no idea how long they're going to take to fix this.