Hi @AfonsoMarques,
Here’s a great explanation by David!
What counts as a Published App?
In the future when the new pricing is live, there will be a way to mark which of your apps are ‘Published.’ By marking your app as published, you will unlock the ability to publish that app to either of the App Stores (Apple or Google), or by applying a custom domain. Publishing to all of three of those with the same app will only count as one Published App.
If your app shares a database with another app, that will also only count as one Published App.
For makers that are already on a paid plan and have published apps, there will be a way in the future to mark which ones are published.
Quoted from here : Details on the New Pricing Plans
Thank you