Not sure if there is. Google and MS have tons of cash to burn during the early life cycle of a new product. Thus they can iterate long and fast to get something the market wants. However, Microsoft got bashed for abusing one successful product (Windows) to eliminate competition for another (Internet Explorer and Windows Media Player). Google comes close to this with the behaviour of thier search engine which has been judged to give unfair boosts to other Google products.

This kind of anticompetitive behaviour would be news. A big bank account all by itself is not.