Bing is a new-comer. But I bet when Google started up, they would have gained a lot by having good relationships with Yahoo and Lycos. Moreover, I would be surprised if Google is not pursuing a good relationship overall with Microsoft even if it tense and filled with lawsuits around the edges.
I dont get this. For example how can Google gain anything by maintaining a really good relationship with Bing.(which in fact they dont!)
Conversely,it seems like you can build traction by picking fights with your competition.Ex Tesla vs Edison, Google vs Bing, Apple vs Microsoft.