Businesses already using some kind of microsoft software that get something "on top" which is "like slack!" are never going to switch.
It doesn't matter that teams is basically sharepoint+email+skype (and not, as slack is: an IRC-style chat system) and it certainly does not matter that bringing bots to the platform is eggregiously painful.
It only matters that business executives and people that have never stepped outside of the microsoft ecosystem perceive it as "being the same" and "being included".