Dear John,
Thanks for the inquiry. To my horror, I realised that I never really thought about this. If, for some reason, someone decided to raid us, it would cause a lot of commotion, no matter how I handle it. However, in such a case I could enable the captchas against bots, no matter how much they annoy and upset me (there's those random combinations of numbers and letters, I always wonder how it works. truly fascinating).
If it were actual human beings doing this, than it would probably be possible to politely show them the door manually, except if they came in great numbers. I don't think that will happen very easily though, since we are but a small piece of paper on the great desk that is 8chan.
Again, thanks for your concern, John. If I missed anything, feel free to correct me.
With high regards,
John Smith