@OP your clear answer is below
Bold area
Most giveaway threads are no longer allowed in the Alternate cryptocurrencies sections. From now on, posting or replying to such threads could result in being banned. Existing threads will be locked.
Specifically, you are not allowed to give people any incentive to post insubstantial posts in your threads. You can't offer to pay people who post their addresses, usernames, etc. You can do giveaways off-site and link to the giveaway page in a thread, but you can't give people any bonus for replying to your thread.
But unfortunately its going on forum. I don't think need to reply on thread for participate on airdrop. But team are requiring it to bumping thread. But they can do it only by google form. In my opinion airdrop thread should ban from forum, they can do it together with bounty thread.