Id assume a bot-net would go for large offices/companies, where people would be unaware of the extra pc usage.
Large offices/companies wont have very powerful GPU's if any at all.
It would be easier to organise a CPU botnet than a GPU botnet, because i can farm large amount of CPU power from "large" companies, but with GPU i would have to gather from individuals, which would be harder.
Large offices/companies are probably running a bunch of shitty old Celerons, I don't think it's much of a threat. And any company that happens to have rackfulls of 14 core Xeons is likely to have a sysadmin that
just might notice the sudden massive load increase or their atomic weapons simulation or HFT algos grinding suddenly to a halt and various red strobing red lights and ear splitting sirens going off.
Botnets are more myth than reality in cryptocurrencies.
Of COURSE it's a threat - one shitty Celeron is not, ten thousand matter.
I hear you, and you make valid points.
But this all reminds me of this guy working at some super computer facility and mining bitcoin with them,
when ASICS were already here.Totally useless and stupid, and I think he lost his job when they found out he used the totally inefficient (for SHA-256(SHA-256)) supercomputers to mine bitcoin.
Yes, it's not just about the hashrate it's also about the number of cpus, but...
Will such a celeron even do 5 KH at 100%?
So 10k of them will result in maybe 50 MH/s?
That's a ridiculously low reward for such an operation.