I'm a security person. I often work with my customers' central IT. I'm not going to have an opinion or judge you, but consider:
You're giving people nightmares. I've seen it go very wrong (front-page news wrong). And then the threads commenting on "how incompetent can they be, blabla". I've worked with the people stressed, sad and disappointed that they got pwned because of shadow IT. It's a ticking time bomb.
The cloud wont save you from shadow IT's insecurities. In two years, when you switch to another SAAS provider, or the domain changes, and the enterprise app is left in your azure subscription, and the baddies notice... Then you'll call me or someone like me, and I can earn my paycheck :)