How many people pay to use websites? One of my side project Android apps made over $2100 in advertising revenue last month, and my other Android apps made hund

How many people pay to use websites? One of my side project Android apps made over $2100 in advertising revenue last month, and my other Android apps made hundreds of dollars in ad revenue. There are a number of ways people monetize Android apps - some games are freemium, and yes, some apps are paid for. I'm not unhappy with how Android monetizes.