Antitrust questions become much more stringent than people might realise. Even if you are 100% "fair game", if you happen to be in a dominant position then you

Antitrust questions become much more stringent than people might realise. Even if you are 100% "fair game", if you happen to be in a dominant position then you have a responsibility to not use your huge clout to win in other markets. Even advertising Chrome on the Google homepage is a very tricky legal question (and the wording on the page!) The MS case is interesting too. Even after basically all browsers became "free", MS is still obligated to offer a browser choice screen in European Windows. Despite basically no barriers to entry, the fact that IE is packaged in by default is still too much for some regulators. It's as if Google has built the only train tracks west of the Mississippi, and nobody else has bothered to build them. Sure, you can get to the bus stop still (or whatever), but the fact is Google is dominant in web access, and must give competitors a fighting chance. Even if it means hobbling their own efforts.