Legally speaking "stealing" isn't even a crime. You might be thinking of a different word: theft.

But to answer your question more directly, here's the most common example: https://en.wikipedia.org/wiki/Theft_of_services

And another for good measure: https://en.wikipedia.org/wiki/Identity_theft

Digital piracy is considered stealing in most countries.

Unauthorized removal of bitcoin from a wallet, depositing into another?