I understand why it is happening, but to force him to pay a fee because someone else got nuked/banned etc is ridiculous. He shouldn't have to reconfigure his VPN do to this. This sites owners need to handle this better, especially since they are banning their sponsors customers.
He has notified PIA, I'm curious to see what they say about it.
What alternative solution do you have to prevent people from registering hundreds of accounts, getting all of them banned and continuing to make more accounts through proxies/tor? The Fee to unban the IP isn't to allow people to buy their way out of bans, nor to raise revenue, its to prevent just what I said previously.