Azure is... really weird like that. Sometimes it feels like I'm working with Amway, not Microsoft.
A few months ago I spent like a week or two playing with Azure Sentinel -- I'm a contractor for a company that develops some security solutions, and I was trying to see if and how the feature I was working on could be integrated with a SIEM. Sentinel, of course, was one of 'em.
So I do my thing, then a few weeks pass, then out of the blue, one afternoon, my phone rings...
...and there's a Microsoft representative at the other end, asking me what I thought about Sentinel, if I encountered any difficulties with it, what my plans are and so on. She seemed to be working off a full report of my usage, too, as the questions were pretty specific.
Thing is, my total usage of Microsoft Azure Sentinel was on the order of, what, 16-20 hours? spread across several months. I don't think I've issued 50 request in total, and I would've issued less than 5 if Log Analytics didn't take like forever to show my data on the free tier (not that I'm complaining, the price is unbeatable :P). I was on the free tier the whole time, it seemed like such a gimmick that I didn't even bother going through the company I was doing all this for.
Either the Azure team is desperate for customers or they have more salespeople than Oracle has lawyers if they ended up calling a small fish like me.