When Qlutch loads, it injects itself into the server so even if the owner decides to remove the plugin they installed, Qlutch will still be present on the server. It is practically impossible to remove!
You can change the name, version and author of all the plugins by opening it in winrar and editing the plugin.yml to make it look as custom as possible to help owners install it! Not to mention the plugins are fully working!
When you buy Qlutch, you have a wide selection of plugins to use when backdooring a server. No matter what plugin the owner is looking for, you'll have it. Even legitimate premium plugins!