Well, if you go to another country and you don't know the laws, you will still get arrested if you break the law.
I'm guessing that varies and is decided by legal precedent only once it becomes an issue.
But my point is this: what service have I used, and what terms can I be assumed to have agreed to if I do this
> wget $random_url > /dev/null
That's what web scraping is. What I do with the scraped material is something completely different.