[solidasparagus]

Cryptojacking is a well-known, major problem for cloud compute providers. Catching and squashing new exploits that allow people to create a fresh account, run up compute bills and then abandon the account without paying is very important.

My guess would be that this is such a well-known problem (within the field of cloud compute at least) that they just didn't think they had to state that normal crypto mining by paying customers is completely fine.

[mr_toad]

Is ‘normal’ crypto mining in the cloud even profitable, compared to custom designed hardware?

[AgentME]

Depending on the cryptocurrency's proof-of-work algorithm and new-ness, it can be profitable to mine in the cloud. I've done it briefly in the past. But generally it's not profitable.

In every cryptocurrency (the popular and functional ones anyway), there's a set global rate of mining rewards. All miners compete for a slice of that reward, so as more people mine, each individual miner gets less reward. (This causes an equilibrium to be reached where more people mine until it's no longer profitable for more people to start mining. If mining becomes unprofitable, some miners will drop out, and the remaining miners will each make a little more.) If masses of people realize that cloud mining for a particular cryptocurrency is profitable, then what generally happens is that lots of people pounce on cloud providers to mine, it becomes barely profitable, and then people operating their own hardware that's cheaper than cloud providers come in and push the mining rewards down to where it's no longer profitable for people to cloud mine.

Because cloud mining is never profitable in the long run, most cloud mining that happens is fraudulent activity using stolen cloud accounts or payment info. (If you're not paying for it, then making any amount of money from it is profitable.)

[vthriller]

It depends on what crypto is going to be mined an how many accounts can be stolen given the fact that there is already plethora of bots that look all over GitHub for accidentally committed credentials. Heck, just a year ago people did scans for outdated WordPress installations to inject, among other things, some JavaScript (!) Monero miners [0]…

[0] https://arstechnica.com/information-technology/2018/01/more-...

[nostrebored]

No. Cryptomining represents an arbitrage opportunity such that the spot price of the instances should be adjusted. In the long run it should not be profitable.