I subscribe to SharePoint Online Plan 1 as shown here. It says $7.00 per user.
I added more than 500 users from office 365 admin and shared my SharePoint Online site with them and it worked.
So I am confused that will I be charged additional amount from Microsoft?
I have not assigned any license to the new user while creating them.
Additionally I want to know that what is the major difference between licensed user using the site and unlicensed user using the site?
Any documentation or reference link is most welcomed.