in other words, it's a good way for scammy developers to make some bitcoin profits quickly through a pre-mine. the price pumps initially, in line with the launch of the marketing campaign. over time, the price dies and never recovers. i won't be surprised if projects like deep onion and POStoken go nowhere.
airdrops shouldn't define a currency. for it to be viable, it has to be a small portion of the supply given in each airdrop. bitsend is a good example. each round is chump change if you want to immediately dump for BTC or USD. that discourages dumpers from joining in the first place, and encourages long term holding. i think other dev teams should learn from this.