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All these incidences happened because of the greed of some people. It is important to control the entry of these kind of people as developers or people behind some new crypto projects. Otherwise people will have very less trust left on crypto in general and people will move to other alternatives. What do you think are the required steps to prevent these incidences from occurring in future ? Or are these unavoidable ?
These are avoidable, they only chose to risk their money on those project because that is a high risk high reward move. Cryptocurrency is all about trial and error, you cannot trust your money even on those "good" project because anything can happen in just the blink of an eye if they really want to run away with their investors money.
That's why it is important to know that it's not always about winning in crypto, it's about risking what you can afford to lose in exchange of experience to make you grow more or instant profits.