How many users does your side project have?

In particular, how many paying users?

I have an idea for a project that would need between ~10-20k paying users for me to consider it a runaway success. At this stage, with 0 users, it seems like a crazy amount of users. The cost would be 5 dollars a month but 4 dollars of that 5 would be redistributed to content makers within the app.

I am curious to learn about some IH projects that have paying users.