Technically, there are 3 types of accounts on server: free, auto-upgraded, and pro.

Free accounts: users who registered after beta period has ended have these by default. They are limited to 1000 albums and have no "pro" icon displayed anywhere (duh.)

Auto-Upgraded accounts: users who registered during beta period several years ago but haven't explicitly upgraded their accounts. These accounts have no limitations on upload (as promised), but they don't display "pro" icon. They also don't have access to pro-only features like privacy controls.

Pro accounts: users who explicitly upgraded their account one way or another get the "pro" icon.

I hope I'm making sense.

Andrei