I hear your onions have to be in the wallet which is connected to your DeepOnion member account. They recently changed the number of onions you have there from 100 to 50.
if tomorrow $onion price will be 100$(or more no matter ) airdrop tasks will be harder or it is stable and will not change....
The only thing that would be harder is for your to obtain the 50-Onions your wallet needs to participate. Aka - it would cost more to buy in.