If you know the IP, it's easy to tar scraper's requests. However the article mentions that now they are being scraped 4-5 requests at a time from random IPs th

If you know the IP, it's easy to tar scraper's requests. However the article mentions that now they are being scraped 4-5 requests at a time from random IPs that are then never reused. It still probably possible to detect scrapers if they start by requesting obscure pages, but in general it's a much more difficult case.