One of the reasons why traders loose money everyday in their trading is 'greed'. A trader will hear about a particular coins he wouldn't even do research or proper findings to know the future of the coins which he wants to trade his money on but rather the greed in the trader will push him to use all he has with the aim of making 4 or 5 times of his trading capital.
Traders are big risk takers so everyone should know what he or she is trading on so that when you loose which is normal, you will learn more.
No trader is perfect but mastering coins you trade on can help you, remember trading is like a gamble you either gain or loose.
Do not trade with everything you have,your egg can not be save in one basket, I have lost but I have gained more in trading with the help of research and mentorship programs.
There are two topical words or phrases I emphasize on which you mentioned and I bold them for the emphases but before then let me also give a reason why traders loose in the process of trading is un-calculated risk. Trading can be an investment if I am not mistaken. And investment is a calculated business by the entrepreneur. In any business they most be a risk taken by the owner and convert it to a profit. In the OP thread he or she made mentioned of "greed" and "gamble" related to trading. Greed? I might disagreed with you on that. I dont think a trader will just see a coin (cryptocurrency) online and dash in and started trading. That is impossible. At least there is a level of observation and evaluation before they move in. You can give example like
LUNA. Gambling, I believed this has been also discussed on another thread. Gambling and Trading or investment are different things. Even though they have the same ideas but different mindset. Gambling you bet while trading is for buy and sell therefore, is there any relationship on them? No of course.
conclusively: Traders loose not because of greed but uncalculated risk while gambling is not or does not look like a trade but for betting.