It's also a scummy thing to do and sets a terrible precedent. Do you want friendly customers on your WiFi or do you want angry customers who feel cheated when they learn the truth?

I think it was basically a joke, and I think his "guests" are friends, not customers, and would therefore be likely to appreciate the joke even if he actually did it.

Ah, okay :)

let's submit patches that mine coins, with the recent 30% perf drop thanks to meltdown people won't notice

I wonder how many use ASICs for mining at public power outlets.

In the past, in Bulgaria, gypsies used to illegally connect to the electricity network to avoid paying bills. Nowadays there's a shift in that trend - there are numerous cases of people running mining farms the same way.