It would if they build a completely free product to price out competitors. Then there's an easy case to be made that they're leveraging market power / dominance

It would if they build a completely free product to price out competitors. Then there's an easy case to be made that they're leveraging market power / dominance in one market to undercut rivals in another (e.g. running this new service with negative profits to gain market share before eventually boosting prices later.)