Businesses don't live and grow forever. They have a lifecycle, and when they get big enough and their business model becomes mature enough, they divert resources away from risky innovation and toward defending the fortune they've amassed, defending their primary cash cow products against competition through anticompetitive practices like patent litigation, and promising steady returns to shareholders. The problem is, this swing toward conservatism tends to fossilize both the product and the organization.
If you fully de-risk your company, it will stagnate. No risk, no reward either. And in Google's quest to kill Microsoft, they are becoming Microsoft.