There's plenty of grey here. For example, scrapers that try to check people in for flights to get better seats. Some that tried to charge for that. That creates problems, where some customers benefit at the expense of others, high load on a "locking type" piece of code, etc. Similar for ticket sales for concerts, and probably other spaces.

There are also companies that provide added value by compiling and correlating "public info" in a useful way that creates value. If Google let me scrape their search and remove ads, it would be popular, but is it "legal"? Or maybe Google Maps?