Honestly, I don't think it's worth making a transaction of 0.5 unless if it's just a cents and if you have large amount of profit per hour and coins but if you don't have a large amount of coins and profit per hour sending 0.5 ton is not worth it.
This profit per hour doesn’t matter because if they’re scam projects, even with the large amount of profit per hour you’ve gathered and all the coins accumulated, it will be worth nothing. So paying that money is not making any sense both for those that have big number of coins and people that have little coins gathered. It should not be mandatory on everyone and if you wish to you can and if you can’t, you should still be eligible for the airdrop.
Both are still the Same, Catien was all about using money to level up and they rewarded base on the money spent, dog didn’t stress people a lot but they actually did ask for transactions too which was around 0.1ton. And they gave those that Carried out the task extra dogs. Other airdrops requires Stars which is another form of payment. So all of the are same and Sooner or later people will get tired
When almost all the airdrops begin to ask for such fees from their participants in order to be eligible for the airdrops, they will one day get tired of doing it and will not believe in any airdrop that asks for money in order to be eligible. Dogs ask for something like this and participants were rewarded more for that which at TGE, many participants even those that didn’t do that transaction were eligible for the airdrop. Using money as an eligibility factor is a red flag, one should just be on a watch out as it has started showing the behavior of a susceptible scam.