This is really weird and defensive from Slack. Instead of telling Microsoft how to do their job, do it better and kick their ass. As a wise man once said, actions speak louder than words.
This is weird to write this. What's the point? Seems like someone got really mad and needed to be a bit passive-aggressive.
This definitely has an air of defensiveness to it. I'm not sure why Slack would choose to position themselves in this way; it's not what I'd expect from the market leader in their space.
translation: screw you microsoft
it's cute slack thinks they succeeded because of their culture