As long as they're somebody else's instances, and you're a criminal who broke into their account.

And that still destroys the environment and enriches Jeff Bezos.

Forget stealing data — these hackers hijacked Amazon cloud accounts to mine bitcoin:

https://www.businessinsider.com/hackers-broke-into-amazon-cl...

>A report from the security intelligence group RedLock found at least two companies which had their AWS cloud services compromised by hackers who wanted nothing more than to use the computer power to mine the cryptocurrency bitcoin. The hackers ultimately got access to Amazon's cloud servers after discovering that their administration consoles weren't password protected.

This is silly, computer time certainly isn't free and almost anything scaled up on a cloud service can become very expensive within minutes. Just go look at the poor developers that make 1 mistake in their Lambda code and get charged $80,000.

Waiting for PoWaaS.

That exists long ago, look at nicehash.com