You are not claiming an airdrop, you are actually buying their coin, and I consider this kind of scheme as dubious, airdrops should be free, we have so many scam giveaway where you have to send a fee to claim it and we have proven that this kind of scheme, so don't fall for it.
By transferring $9 in exchange for their coins, you risk not only your money, but also the disclosure of your privacy. It's possible that the team thinks their coins are equal to 100 CHF, but why would they give it away for $9? These coins most likely may not cost anything at all and your money will be sent for nothing.