This kind of "ghetto colo" is prevalent in the cryptocurrency mining space, now (where power consumption is probably 10x higher) -- either using hardware ASIC m

This kind of "ghetto colo" is prevalent in the cryptocurrency mining space, now (where power consumption is probably 10x higher) -- either using hardware ASIC miners or PCs with many GPUs. Often the hardware has an in-service lifetime of months, vs. ~10 years for some enterprise or networking equipment, and outages cost a lot less (a 75% reliable datacenter would be a joke; a 75% uptime crypto mine that cost $0.01/KWh might be fine -- "turn it off during peak load periods" or otherwise pre-emptable by the grid.