ISPs are supposed to disconnect abusive customers. The correct thing to do is probably contact the ISP. Don't complain about scraping, complain about the DDOS (which is the actual problem and I'm increasingly beginning to believe the intent.)
Imagine if Chinese or Russian criminal gangs started sending mail bombs to the US/EU and our solution would be to require all senders, including domestic ones, to prove their identity in order to have their parcels delivered. Completely absurd, but somehow with the Internet everyone jumps to that instead of more reasonable solutions.