The premium security plugin that we use has a good weight in all the work we do, although it is not the only thing we touch. After a year, the license will expire unless it is renewed, so the plugin will no longer be updated, which will affect the security of the site and for this reason we strongly recommend to keep it. The annual license has a very low quota compared to the work that is being done by the security system. We consider it a very good investment, since an infection of the site would cost a lot of money and time to clean.