There's no official requirements provided on how to qualify on their airdrop.

But this article give some hints about what people should do to possibly qualify on upcoming Metamask airdrop https://cryptonews.com/cryptocurrency/metamask-airdrop/

So I guess its better for people to do those activities if they are really aiming to get a share from their airdrop so that they can possibly increase their chance to qualify. Also lets see the legitimate announcement that will came to official sources in future.