[al-king]

The 'airdrop' analogy doesn't really capture anything about the involvement of branching ledgers, so it doesn't seem entirely unfair to use the same giveaway jargon the community's previously used. But definitely, a different mechanism is involved here.

[SilasX]

It captures the metaphier of “you do nothing further on your end, and stuff of value falls in your lap”. This offer doesn’t do that and requires active steps on your part. If it’s air-anything, it’s “air rendezvous” :-p

[al-king]

ah, well, for preexisting Keybase users with linked GitHub accounts it fits that description - I found out about it because I got given some without doing anything.