This might be true in the USA, but the EU has a thing called database rights[0]. Essentially, any collection of data can under certain circumstances be protected under database rights, which prevents other parties from copying (parts of) it. This originally was created to protect such things as phone books and other directories, but when I was a student (I don't remember the context anymore), they specifically warned us that scraping certain websites would violate their database rights, and thus be illegal. So using scrapers in the EU is something you should be very careful with, especially if your business depends on it.
[0] https://en.wikipedia.org/wiki/Database_right