I think so too. But in that case its declining userbase is also a concern. A tiny competitor isn't going to stave off antitrust action. For that there must be substantial competition.

I wonder if they'll continue bothering with the deal when Edge continues to grow. Sure, Edge is just a reskin of chromium but it's run by a different company so that'll be most likely enough for market regulators.

And it's not as if they are just giving the 400 million dollars away - they earn billions of dollars from Firefox users and they give a percentage of that to Firefox.