Corporations are made by people and are led by people. I wish we get rid of the limited responsibility stuff. You're the CEO, you go to jail. This would probably break large companies in a multitude of much smaller ones to manage risks. How many people can you manage and be reasonably sure don't do something that sends you to jail? Not many. We would still have software, FOSS demonstrate it, and entrepreneurs would still find a way to create new things.
The point is that Microsoft effectively "bought" that good will with developers and now they've cashed it out. I have no plan to trust them, and if I hear the "actually Microsoft has been good for open source" argument, I can finally counter it with reality.
I never trusted them and I'm not using their products unless I really must (a customer's Windows server, their Android PDF reader or Google's one, maybe that's it.) But yes, when one is young and exposed to Microsoft for the first time and see them behave it's easy to dismiss the tales of old bad behavior. If one is 40 or 50, it takes a lot of naivety to trust them or any similar corporation. If anybody did, they are hopefully changing their mind because of the facts of the last few years.