As long as it's not "use it to fix the system in our favour", it doesn't matter.

And if they can't figure that out (hello Mozilla?) then the worst that has happened is we have a more even distribution of user agents on the web, and people stop coding for a single engine whilst ignoring breakages for the smaller players.

What's Mozilla corp's?

I mean, Microsoft would surely love to be the browser leader again. The web has always been an amazing device and OS neutral platform play, which is why they entered the space in the first place. Do I expect this to happen? No I do not, but there is clearly a huge value to owning the most popular web browser. Safari is a distant second and is probably 98% iPhone usage.