European approaches to antitrust differ to the American approach. It is much more about fairness to market participants and the result is that we avoid Microsoft having an unchallenged avenue to dominance in yet another market. Optimising markets is a vital role of the state in any country where inhabitants don't want to see regulatory capture or market dysfunction (as with say, the American broadband and mobile data markets). It is likely to preserve choice, encourage innovation, and allow new market participants if Slack's case is accepted.