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.
The bottom line is that most of the crypto investors are not professional ones. They don't make their own due dilligence and allocate their portfolio as a professional would do. Most of them just look for opportunities where they can make a fast buck, not invest for the long term. That's why the so called "ICO bonuses" had so much success that the token quickly dumped as soon as it hit the exchange. That's why projects should not offer more than 10% bonus for early investors because at the end of the day if the token economy and business model has potential the value will raise accordingly.