When your organization is so broken that it's easier to buy a separate domain for your team, than to go through the process of putting it under the main company domain.
Yeah, I really don‘t understand why companies on one side try everything in their power to teach people to be vigilant of phishing and then do stuff like this. Azure does it too with www.microsoftazuresponsorships.com I always feel like one of these days I will get phished if those are the domains they force me to use :(