This happened about 10 years ago when eBay sued Bidder's Edge over its scraping of eBay's listings to gather statistics [1]. eBay sued, and although the case was never fully developed, the preliminary injunction issued against Bidder's Edge killed off an entire cottage industry of auction tools and analytics services, including the company I worked for at the time. I believe it also helped solidify eBay's dominance in the online auction market as the disappearance of these services made it much more difficult for buyers and sellers use multiple auction providers (anyone remember Yahoo! Auctions?) in an easy way.
[1] https://www.law.upenn.edu/fac/pwagner/law619/f2001/week11/bi...