MSI. Many router vendors have sloppy configuration . It's always good to double check.

Me neither, and I've even checked an old ISP-provided router.

Mate. The shit that a retail ISP will send to the punters. Adjust your expectations sharply downward.

The reason this crap ends up in botnets is because it suits retail ISPs to have a common password for their own access. I've found that password on a forum and used it to get higher privileges than I had with my own login. And yeah, web management over the WAN was enabled by default.