As a fish user and a rust user this is awesome

Its not and everyone who says it does is full of shit. The reason linux doesnt need av is that av is secretly overrated

By pwning it. You dont have to find it to pwn it. You just have to be able to send data to it, which everyone can do because whats the point of having a server if noone can interact with it. The attacker just interacts with it in a way that manipulates it to execution attacker controlled code. So for a .onion website for example you find a vulnerability in the websites code and exploit it to make the server the website is running on do what you want.

How so?