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.
There are lots of factors contributing to the investors mixed feelings about any project especially when it value falls below 75% of the ico value.
Most investors that often buys into a project ico are already used to the traditional stock exchange and 50% reductions in share price simply means that the company is having problem and might fold up.
Most ICO project often have road map which investors expects them to maintain and follow truthfully.
Above all, people invest in any project for profits and will surely be unhappy if they did not see the expected profits within 12 months after the end of the ico.