Scraping websites like AliExpress and Ebay for trademark and brand infringement. There are many vendors who sell fake tat on the internet, and there are companies out there who track it down on behalf of the brand owners.

These companies tend to have armies of lawyers who can swat away even the likes of eBay when it comes to justifying web scraping. Nevertheless, the work required is still the same tedium that others deal with: CAPTCHAs; throttling; IP bans; etc.