I saw their airdrop offer a couple of weeks ago when a YouTube channel named Ilme Aalim posted a video about this airdrop. But, I didn't pay attention because these airdrops never payouts well amount. Most of these airdrops pay less than $10 and the participants need to work hard for these ten bucks! That is not the point. What they would do with these test net tokens? They could have set up a faucet for their users. I don't know what is the supply of testnet tokens and if it has any special usecase.