Is AppSheet for a small gourp?

[Shibata_Hidetos]

As far as I this page,

help.appsheet.com

Require Sign-In: The Essentials

How you can secure your app with user sign-in.

AppSheet seem to be good for a small number of users.
For many, such as 10,000 users, AppSheet costs lots.
Is it correct?

Hidetoshi