For me personally - if it requires a minimum of effort-airdrop. If airdrop is "encouraging", then all you need to do is one repost or registration on some resource. If the airdrop is "automatic", then you do not have to do anything at all — the essence of the" automatic " airdrop is that some tokens are awarded for the fact that you have a certain amount of other tokens. And even more so if this is an "encouraging" airdrop, and the project has its own blockchain, and it is not yet very popular in society, you will 100% have to fill out something, or subscribe to social networks.
But you need to perform some additional actions, monitor something, and periodically write that this is a bounty campaign.