[eridius]

The link isn't removed on the keybase side but the next time it's checked it will be flagged as bad. Clients will check it automatically when you follow; otherwise, I believe what happens is the system will periodically check it and cache that data for some time (so that way you're not hitting the external services every single time you visit someone's profile).

I would assume the airdrop ensures the GitHub/HN proofs are up-to-date before sending the lumens.