What if they have a script that automatically changes the slots when they reach a certain amount of people?
Our system queries the server constantly. If the user also changes the query mechanism, which isn't possible, since he can't update the core files. But even if he manages to do that, we also have human people monitoring the server. And he can't use it, because the MTA browser also detects this query and tell the client that the server is full, even if it isn't and the amount of slots is changed.
oh,ok,nice system