People who hold bitcoin are usually very strategic people, who know that eventually bitcoin will go up. If we can look at it`s history it had many rises and falls of the price, but at the end of the day (or year) bitcoin went from 4k to 7 k in a few weeks. Then all we have to do is straight our definition of what greedy means. To be greedy is to want more and more of a resource and thus actively harming a specific group of people. At some point you have to sell the bitcoin in order to get your fiat currency so you will "share" it with others no matter what. You can`t be greedy 
Very well said my friend, I totally agree with your great thinking about Bitcoin. If we want to achieve anything in our life we have to plan it and have to adopt some strategies to achieve it. So thats why, we hold our Bitcoin for some long time and as its reached its peak, we sale it. Because we have to observe that there is so much fluctuation in price of Bitcoin. And its not greedy to hold Bitcoin and sale it when its price is height.