Airdrops are a great way to attract people into newly-fond crypto projects. They're basically "free money" for not doing anything in return. Some projects have been widely successful after an airdrop, while others have gone all the way down the drain. There's been a upsurge of airdrop hunters looking to "milk rewards" from the system, effectively dumping all of their coins/tokens on the market for profit. While most projects have been quite flexible in the eligibility for an airdrop, one project decided to take the stand by adopting measures to prevent abuse. Parachain Swap's airdrop has been quite controversial as it only rewarded a small portion of its users. The vast majority of the people weren't rewarded (especially airdrop hunters), resulting in a decline of the token's price.

Do you think it's a good idea to penalize airdrop hunters? Will this do more harm or good to the adoption of crypto/Blockchain tech? Your input will be greatly appreciated. Thank you.

I have heard many people say that never sell for a loss but what does it actually mean ?

Assuming you have bought a coin at $10 and the price goes down to $9 but you don't sell.
You could have placed a stop loss at $9 but you take "Never sell at a loss" so seriously that you decide to not put a stop loss.
The price goes down to $8 but you are too good at HODL. Suddenly the market crashes and the price goes down to $5.
You could have limited your losses at $9 but now your portfolio is down by 50%.
Now the price has to go 100% so that you breakeven with no loss no profit whereas you could have bought back at $5 and gained potential profits using a stop loss.

This is why I think "Never sell for a loss" is a myth and we should always use a stop loss and play safe with a good risk to reward strategy.