It took a lot of computing power to generate this database. it was clearly written there that means its clear that his program was not finding used bitcoin addresses insted it was creating new bitcoin addresses into the network. it seems very frustrating that one person created so many addresses and its just a waste now. i have seen this site a while ago like around a year ago maybe. this is basically the person who is trying to spam the bitcoin network.
It doesn't work like that; You don't "create" Bitcoin addresses. All the addresses on that site are simply generated on the fly when you access a certain page. It doesn't spam the network unless the addresses are actually used in a transaction.