I don't really see any evidence of abuse in this post, though. It doesn't really say what Microsoft did, other than ban them from github after they said they will "make Microsoft's bones shatter".

It reads to me like Microsoft didn't pay him what he thought he earned from the exploits (i have no idea who is in the right on that), and then he published a zero day with no notification and threatened the company. Doesn't seem ridiculous to ban them at that point.

Again, I don't know the details so I cant say who is in the right, but the researcher comes off as a little bit unhinged and entitled. Not paying a bug bounty is 'ruining my life'?