Should I use multiple apps in one Firebase project just to use the same authentication system?

Question

For example, Google has different-purpose products that use the same authentication system like Google Photos, Google Drive, Google Play, Google Meet, etc. Each product of these serves a different purpose, but they all share the same authentication system.

I want to do the same for my apps. I've like 3 apps, but I want them to share the same authentication system, so if user 1 creates an account in app 1, they could sign in to app 2, or app 3 without re-creating the account. So is that possible using Firebase Authentication? I saw that each Firebase project can hold up to 30 apps. What if I wanted more at some point? For things like Realtime Database, I was planning to create:

General
  Data is shared across all 3 apps.
App 1 
  Data-only app 1 needs.
App 2 
  Data-only app 2 needs.
App 3 
  Data-only app 3 needs.

But for things like Cloud Storage, I'm not sure since there's no way for nesting stuff there.

Any ideas? Is my approach wrong?

Answer 1

As @Rainy mentioned in his answer, yes, that is perfectly possible. The best part is that you can create up to 30 apps within a single project no matter what the platform is, Android, iOS, or web.

I want to do the same for my apps. I've like 3 apps, but I want them to share the same authentication system.

Yes, all apps will share the same authentication and databases, Firestore or the Realtime Database.