What is HN’s opinion on the legality of these types of scrapers? Instagram’s robots.txt disallows this kind of scraping, same for their ToS. Legal precedents have been mixed - the recent LinkedIn vs HiQ case is a good signal, but it’s still in appeals court.
If you don't want me to scrape it, don't put it on the (public) internet. Simple as that.
The physical world has plenty of laws and/or common sense/customs about what behavior is not okay even though it is fully possible. Why should the net be any different?