Originally Posted by fysiks
Use an existing advertisement plugin or request a new one with the features that you need. You should never run a plugin to which you do not have the source code because someone could have easily added a backdoor into the plugin (meaning that someone could hack your server).
What sorts of backdoors are generally possible to implement in a plugin that could harm a server? I have a similar issue and was genuinely interested in knowing what a developer can do to servers by releasing an amxx file that looks appealing to people but does shady stuff behind your back.
I also believe he's talking about a necessary plugin that has an advertisement function in set_task printing a message every minute or so, and he wants to prevent that message from showing up on the server.