Sometimes instead of "why?", people ask themselves "why not?"
Beyond that, the admin just bought the domain once it became available and installed (and translated) a few instances of 0ch+ and fikaba scripts to a server. No witchcraft or sacrificing of first-borns required
think a lot of people over-glorify the original world2ch... it was a tiny, slow, and short-lived website of no real influence or impact, besides the historical footnote of (probably) being the first English-language 2ch-clone. It was still operated by a Japanese guy though, and half the users were Japanese natives writing in broken English, so its debatable whether it really counts