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.
In my own personal opinion, investors became impatient because they are now getting scared to take some risk in projects which they believe that it is successful, but it turns out to be a scam or the coin will don't have a good value, that is why investors is starting to judge a lot of projects nowadays because they didn't receive any good profit from it.