Scraping by itself shouldn't be illegal per se but not respecting policies and using glorifed bot nets won't help anyone. Scraping costs the hosting person/ company money and/ or resources. For example, the advertised use case of scrapping a job board to create an aggregator for job postings is maybe good from the point of someone searching for a job but a hefty punch to the hosted of the job board that has potentially hefty costs (running the board, moderating, ...) without any gain.

Scrapbee is not helping anyone but themselves and is only challenging the legality of commercial botnetes IMO.

Edit: changed 'public botnet' to 'commercial botnet' in the last sentence