But I can get the same data with manual browsing. And I can just as well pay some chinese to collect the data and input it in my database.

Automated scraping is just a way to drastically reduce labor costs for information collection. Sure, it's a competitive advantage, but I think disallowing it or calling it unethical is a pretty big can of worms. Why is it ok if something is done by humans but not ok if a computer does it by himself?