500M MAU also implies that some are already paying. They need to extract 1$ more on average, not just get all of them to pay 1$ per month. This, I imagine is ha

500M MAU also implies that some are already paying. They need to extract 1$ more on average, not just get all of them to pay 1$ per month. This, I imagine is harder than assuming there are 500m users that pay nothing today.