WotLK What can a multiboxer do or not?

[Galdrym]

Good morning have you.
Today I was going directly to the suggestions section to talk about my opinion on the multi-box topic, but I read the rules a bit and I see that it is an old and stale topic and we don't talk about it anymore.
So, rather I come to ask and inform myself about what things a multibox is allowed to do or what not.
I have seen some multiboxer invade entire cities to lower hours of server population by killing all npcs (starting with the auctioneers). If someone decides to fight him, he kills him and farming him sickly. And they stay for long periods in the city waiting for some brave face and when it appears, the same behavior is repeated compulsively.
I've also seen multiboxers (balance druids, of course) that stay in the winter conquest fortress (when it belongs to the opposite faction) waiting just before the battle begins, waiting for everyone for cast "Starfall" and carry out a complete slaughter from minute 0.

And many more things that I haven't seen yet.
You see, I'm new to the server. I am starting a new adventure here and I am trying to enjoy it as much as possible.
But when I meet a multiboxer, the party is over.
So, I come here to ask as a player, how can I protect myself against a multiboxer? Is there anything that is prohibited? Do you have any type of restriction?

It is a question without malice. I am so happy to be here.
Thank you. :P

[Mitzen]

Multiboxers follow the same rules as you and me.

[vidazs]

What can a multiboxer do or not?

-please mr gm, I would also like to know what multiboxing can do or not do thank you, greetings to all :)

-please gm I hope your answer thanks :)

[dolcokidol]

No need to open up 2 threads but ok.
They can do everything that other players can do. Dungeons, raids, battlegrounds, arenas, world pvp, sitting in front of the bank, you name it.