During time when Sergei and Larry wrote code for Google. It won&#x27;t have been possible for them to survive without huge costs, if not using gnu tools and many gpl utilities, bsd code is their but not as much at that time. Moreover using bsd and then earning by making it closed source is even worse without contributing back. Indeed for that matter even today they won&#x27;t survive without gpl code. The amount of gpl code used within Google compared to the code they contributed back you will still see a huge gap.