Bounty hunters are alwasy blame for selling their tokens so quickly without waiting for the project develpment as outline in the roadmap. I don't think bounty hunters are to blame because a lot of bounty hunters hold their coins for years.
this is how the team and the developer have a strategy to deal with each dump situation after entering an exchange.
of course not all bounty hunters will release their tokens after entering the exchange. so I'm not sure this is the only problem.
the lack of experience of the team and the developer is the main factor. yes, in my opinion