Given the prevalence of people using multiple accounts, I think this course of action was unavoidable. Can't say I'm happy about it, but we, as a community, can only blame ourselves. Those bounty hunters with multiple IDs are a part of our community, so we have to wear, sadly... or give up on bounty hunting.
Actually they don't really care much about multiple accounts as the sums involved in bounties are miniscule. The law in most developed countries demands KYC for every holder of a security. Most utility tokens are securities, so everyone will have to get identified or the company is liable.
This is a good development and a step towards greater crypto adoption, but on the other hand it will piss of the anonymous crowd hard, because it means crypto is becoming just another big money playfield.