Your license does not grant any rights to the user. So from a legal point of view, no one is allowed to copy or even use the plugin. :-(
All your license does is excluding your liability for everything.
Compare it with, e.g., the MIT license which contains a section granting the user
Permission [...] to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software
Your license does not grant any rights to the user. So from a legal point of view, no one is allowed to copy or even use the plugin. :-( All your license does is excluding your liability for everything. Compare it with, e.g., the MIT license which contains a section granting the user