I don't think they need to buy traffic directly, as they have a lot of visitors because of bounty and airdrop programs.
for airdrop, in my opinion, yes, it still makes sense because it requires access to the website to participate, and for bounty, I don't think it is necessary to access the web because without it the hunters can do their job, to buy visitors actually, it could be because this way can make investors or whatever it is to be interested in joining cryptoknowmic it's just that I'm not sure this site buys traffic.
As for now, they are not very successful inviting investors:)They aren't even close to the soft cap.