Comment by bored_hacker

I'm actually not so sure that there terms of services prohibits scraping for personal use (or scraping at all) but maybe my understanding is incorrect. I have read through them here https://www.zillow.com/corp/Terms.htm and looked through there robots.txt here https://streeteasy.com/robots.txt. This is most likely because they use Distil Networks and rely on them to block web scrapers. But you are right this is something of concern and I can add a section talking about the dangers of breaking a sites terms and conditions and how scraping must be done correctly even for personal use