Last 12M ending 9/30/2015 (last available financial data): Google did $71.7Bn in revenue and $14.7Bn in net income. I assume the lawyer meant that Android had generated $31Bn since inception, but that can't mean gross revenue since they only take a 15% cut on the Play store (so wouldn't be able to show $22Bn of profit (71% margin). So $31Bn in net revenue implies $207Bn in gross revenues. The Apple App Store did $20Bn in 2015 and generated 75% more revenue than Google (http://blog.appannie.com/app-annie-2015-retrospective/), implying $11Bn in gross revenue for Google Play, or $1.7Bn in net revenue in 2015.