Why can a wordpress template developer delete the template and stop supporting it?

Why was the Wordpress Template with the name Transport & Logistics from Gloria Themes removed and stopped supporting it. Is it permissible and not penalized?

Unfortunately yes this is allowed.

Envato do not own any items sold here so they have no control if the author wishes to, or is forced to leave. This is how envato can offer the quality and quantity that they do compared to any other marketplace.

This is outlined in the t&c that buyers agree to when purchasing an item.