Because MS is also into advertising that is not likely.
But if it did that Google would block Windows users' access to their services and show a message that MS is responsible for this mess _and_ sue MS for anti-competitive practices.
But if it did that Google would block Windows users' access to their services and show a message that MS is responsible for this mess _and_ sue MS for anti-competitive practices.
Not that that will prevent a suit, but it would be useful as a defence.