1. Bounty hunters always want to dump and get out as soon as possible
2. The market in general might be far lower than the way it was during the ICO period
3. People sense something Fishy in the project and the want go out.
You forgot one and I am not sure why you excluded them.
4. There are many investors who bought a lot of tokens at a discount during private sale and pre-sale also dumps the soonest time possible. Note that they have more tokens to dump compared to airdrop/bounty hunters.
Now the QUESTION is what could be the curse? and what is the Solution
There are two major reasons that may cause this; 1. Bounty/Airdrop hunters and 2. Newbies who only heard that crypto investment yield interest.
There is no curse. People sell for whatever reason they have, there's no point in blaming sellers since it is their tokens/coins.
SOLUTION
My solution here might not be right but this is how I see it.
1. Pay Bounty/Airdrop hunters with ETH, BTC or any Popular Coin thats already trading in the market
2. Buy Back some initial dumpers, which will make almost everyone else not to dump any more
- I do not get the logic of paying in Eth or BTC. Why would they do that? The reason why they do a token sale in the first place is that they want to collect ETH or BTC to finance the development of the project.
- Buy back is a good strategy.
If I may add, lock all airdrop/bounty tokens and also those bought during private sale or pre-sale to 1 or 2 months. Many will not want that but there is a higher chance that the price will be above ICO once the coin or token is listed on exchanges.