The biggest mistakes developers make that leads to bad ending for many projects are
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3. Bad Exchanges
Imagine new projects that make over millions of dollars in ico or ieo and end up listing on bad exchanges with no enough volume, what do they expect to happen?
the most fatal mistake is the third point. I can not understand why many projects that end in shit exchange can not provide hope. At least by spending more funds for listing in a more compatible market, I don't think it's a problem, instead it can be a booster to increase the confidence of other investors in strengthening market capacity.
Indeed, many developers are repeating the same mistakes and some of them do that in purpose just to earn money. There are devs that create projects that are meant to fail thus, also failing the goal of cryptocurrency. This has been observed too many times in 2018 that caused the downfall of the reputation of the altcoins.
So the goal is simply to collect money, there is no project development, and fundraising is only used to get maximum profit, blame the bad market conditions, there is no continuation until after a long time they disappear. Very ironic, so don't be easily fooled and love your money for safer investments at times like this.