So some of my friends says such funds are free money so they are delighted dedicating it to be spent on gambling and when they lost it all, it would be easier to let go because they did not stress to get the money.
The thing about airdroppers is that they don't see the investment part of what they are doing. They thing because they are not investing money in it means no investment since they are only doing task as requested by developers but that is investment also because you involve your idea and also, time that they use in it is investment. Therefore, they should see it as investment and whatever proceed they get in the airdrop should be seen as their profit or even salary for their labour and should be managed and used judiciously. So if they want to use it in gambling, it shouldn't be frivolous but more pragmatic in their bankroll. Even when you get a gifted money and you want to gamble with it, you should maximize it for more gains.
To me, they can utilize these so called free money by adding it up to their Bitcoin portfolio or even used it to spend on necessary things instead of dedicating to lavish it on gambling.
Of course, even if not to buy Bitcoin, they can cash out some and use the money for personal use while investing some in other coins. There are people who cashed out big from Notcoin recently, they only splitted part of the profit and left the rest in Notcoin, that is a good investment. And then if you want to gamble with some of the profit you can do that but not to be careless about it because of the feeling that it was just airdrop money rather than seeing it as profit from labour and investment.