Vattenfall (a big Swedish energy company) had the same for a while. Their marketing created a website where you could log in as a user, on a completely different domain.

Most have been fixed but my current pet peeve is receiving email newsletters from these companies with tracking links. I get it, you're trying to measure something. But they're genuinly sending you links like sx4pv.mjt.lu/lnk/EEEAAAA-3434-asdfasdfasdf