Try looking up how Nano was distributed in it's early days. It's a very different story - miles more egalitarian - than BTC or ETH, or the vast, vast majority of other assets.
Airdrop by captchas is miles less egalitarian than making people mine for coins in a fair competition over decades. Worse yet, there's no way to verify that a majority of coins didn't end up in the hands of just a few people