They would want the user base, i.e. those who has gone out of their way to pick something different, than Microsoft/Atlassian, like Notion

It's got to be pretty small and not the right customer base for Microsoft.

Despite Slack's presence in the startup space, Teams dominates the market (fair play or not different story).

I'm not sure I buy Microsoft being that interested in Notion's customer base.

They are doing loop, so there's something there, however small