Is Microsoft mopping up the enterprise users who don't want to use Slack or is it actually taking away users from Slack? The article seems to imply that Slack

Is Microsoft mopping up the enterprise users who don't want to use Slack or is it actually taking away users from Slack? The article seems to imply that Slack has its place among smaller groups/businesses while Teams appeals to larger organizations, especially those with Office 365 (due to bundling). But I think it would be a lot more interesting if Slack was losing users as opposed to just not picking up enterprise users (which is still somewhat interesting). Has anyone worked with an organization that switched to Teams from Slack? What was the reason?