Google gives away Android as a competitive moat to both a) increase the amount of time spent on Google Services and b) decrease the threat of a mobile monopoly

Google gives away Android as a competitive moat to both a) increase the amount of time spent on Google Services and b) decrease the threat of a mobile monopoly changing the default search engine (Imagine the threat of an Apple with 80% of the market and the negotiating power they'd have for the setting of default mobile search) A fragmented, federated mobile ecosystem with more players results in more people using Google services even if competitors can take Android and strip out the Google-installed services (e.g. Amazon). For Tesla, making electric cars in general a success will increase demand for electric infrastructure investment, and in turn, a robust electric infrastructure, along with cultural normality of electric cars, means increased demand for their own products. Android really hasn't increased ad space all that much. If people use mobile more than desktop, the likely result is mobile is leading to decreased ad spaces, just from the mere fact that the screens are smaller. So if anything, it is a defense against a downward sloping trend.