Licenses are based on the usage of the end product and on end users.
End Product is any artifact (website, software, web app, mobile app) produced that incorporates the Item or derivatives of the Item.
End-User: a user of an End Product. End users can be unlimited for any license.
We will explain the terms with a simple example here.
Example:
There is a "Grocery Store A" which has "100 customers" and has asked you to develop a "Grocery App".
"Grocery Store A" is your client/you.
100 customers are the end users which can be unlimited.
"Grocery App" is the end product
End Users are Charged Means:
It means that the end users will pay subscription fees to use your service.
Example: Grocery Store A sells grocery items online via Grocery App (i.e. end product). They have subscription charges for their users (i.e. end users) to use their service for ex: amazon prime. Here the end users are charged.
Note: If you are selling eCommerce products or any digital item then it doesn't come under "charging end-user"
If you have any query regarding which license should be perfect for you then refer to the License Page