understand that run more hub will make sync harder for farcaster dev. 

However I totally DISAGREE that those ppl are destroying the network. 

Farcaster is a open social protocol and should welcome anyone to run a hub regardless their incentive. 

If you don't want this there is one solution. 
Just run a gated community so that only ppl get auth could run hub. 

And then basically become twitter :P

This will happen even if the growth of hubs is not driven by Airdrop farmers, but by more apps needing their own hubs as the Farcaster ecosystem grows.

We need more fundamental solution than restricting farmers.

Farcaster is a "sufficiently decentralized social network", not twitter.