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.
This is all the effect of the last crypto bull. People realized crypto is a way to get overnight riches. And it was true for months. Whatever coin people bought doubled within a few days making heaps of profit. Many people jumped into crypto just for quick profit. They never tried to realize that crypto needs to gain it's price through use or service.
Projects raises a funds so that they may deliver effectively for a later time but people wants a profit just after the end of the ICO.