[vabole]

I wonder when will the bitcoin mining viruses appear. If done stealthily they could use spare resources and fall back when other GPU/CPU intensive task is launched. Such virus could be quite profitable if it spread widely enough.

[Groxx]

And easily detectable by owning a laptop (that burning sensation isn't a UTI) or having fans in your computer (harder to tell if you live near an airport).

[rmc]

Since bitcoin mining is rapidly getting uneconomical on non-specialised hardware, if you control a botnet you probably get more money from the usual botnet activies like spamming or ddosing.