~
I think this is because the ICO devs doesn't want hunters selling their tokens quickly just after the sale.
They want to prevent dump by locking the token. But i think it is not necessary to lock it, because usually hunters received only small percentage.
Exactly. Let's examine this particular campaign from the OP, for example. The total supply of Liker is 3,000,000,000 LK, and according to their bounty thread:
Total Token allocated for this bounty will be 5,000,000 of LIKER Token (LK)
5,000,000 : 3,000,000,000 = 0.0017
Selling 0.17% of all tokens, even in one day, can't make a big impact on the price, in fact, it's not even close to that amount that could make an impact. So, locking the tokens of bounty hunters for a long time is an unnecessary measure in economic terms.
The main reason for such a measure is its psychological effect on the investors, who can feel privileged knowing that they are allowed to sell their tokens while the bounty hunters are not.