Airdrops are a fascinating initial use case for ZK / blockchain-based identity / credential / attestation frameworks. The goals of an airdrop are:
(i) distribute to community members [and not randos who will all immediately sell]
(ii) reward contributions to the project
(iii) be reasonably egalitarian [but some disparity is ok]
(iv) resist extractive/adversarial farming
These are exactly the properties that identity / credential / attestation frameworks (eg. see ideas in
vitalik.eth.limo/general/202… ) are trying to achieve. Hence, for anyone building such frameworks, it makes perfect sense to use token issuance as an initial use case to beta-test and refine their work in an adversarial environment.