Monthly Active Users, MAU, are not ALL your users, but only users who opened your app or were sent a Push message at least once a month from all of the apps in your account. For complex solutions server loads in SaaS depend on how many users actually use or called to use the app, not how much storage it takes. Also we find storage as impossible and unfair to judge by, because calculating storage used is obscure and uncontrollable for you. Users are clear and easy to check.
There can be 2-3-10 times more users in your database who installed the app, but do not use it, or who deleted the app, but you still hold records of them. We hold all of this data without adding to charges. However we reserve the right to clean users who have not visited your app in 6 month or more, refer to Terms.
You only buy blocks of MAU/Pushed, for example, you can have 10 blocks of 10 000 active users, or a single block of 100 000. Our service will not stop if you go over the limit, but will be automatically pro-rated with additional block.