This is a serious bug and I didn't expect this to happen. When you set a site limit on a package, the software correctly stops the user from creating a new site and warns him to upgrade his plan.

But surprise, surprise, the user can just clone his current site and bypass the limit. He can clone as many times as he wants to have as many sites as he requires.

Seems like a very serious bug and very easy to fix. The clone feature should just check for the package site limit like the new site button does.