re: Think ACs in a computer room on a really big scale
Yes I am - I have their phone numbers and everything!
Seriously, this article goes into detail as to what is being talked about:
http://www.futurehi.net/docs/Matrioshka_Brains.html
As for enemies, while there may be those who would like to harm/steal/
destroy such Artilects, I can't imagine them being very worried about
anyone or anything that isn't at their level as a threat.
If anything, we should hope they don't think of us like we do cockroaches
in the kitchen.