If "generic", grey-market or ASICs using stolen IP eventually come on to the market, I can imagine backyard operations running on wherever electricity could be had cheap or stolen.

For years the web hosting industry had a problem with cowboys operating out of their mom's basement. The difference here, however, is that such a private venture needs not concern itself with uptime SLAs, multi-tiered bandwidth, power conditioning and backups. Just keep those Alibaba-sourced ASICs running on the smell of an oily rag. UL and FCC approval would not even be in the vocabulary of such miners. VESDA fire suppression? Contract your rigs out to Bangkok.