No, nobody is entitled to any airdrop for any coin (including those that received one). Technically it is up to those that create a fork to decide on the rules for the initial distribution (if there is one).

Airdops are gifts, for the most part meant to entice the people that receive them to become users of the chain in question.

Now, in the specific case of the 300 accounts I would not give coins to all of them. Some belong to individuals who openly sided with Tron and/or were outright hostile to the Hive fork. For them I say good riddance. Others were acting out of principle but in my opinion made a bad judgement. I have no problem approving proposals to the latter.