It usually surprise me when I see investors complaining about a good project that didn't increase or providing returns immediately it got listed on the exchange and they term it scam or say different things like rekted.
But the truth is, are these investors investing in the project because they believe in it or are they just in it for the immediate profit and move on? Because if you are investing in a project because you believe in it then you should be willing to HODL the tokens and wait for the team to gradually deliver the project and meet its necessary roadmap before you judge it and not condemn it on its first listing.
Most of the newbie investors are investing not because they believe in the project but because they believe that they can double or multiply their investment after the tokens that they brought will hit the exchange.
Because of this kind of mindset, most of the coins price will go down immediately upon reaching the exchange. Even if 60% of the investors will know the term of HODL, I am sure that any project that they will support will continue to grow especially it's price even after listing.