Whenever people talk about greed, I remember the "greed is good" speech by Gordon Gekko, it is a movie obviously but it does explain to you what the insides of financial world is like. I think greed could be used very well, greed is not just about money neither, greed is about wanting more than what you have, and even more than what you need, greed for art, greed for knowledge, greed for love, they are all possible things and could be used alongside of greed.
In crypto world you could always be greedy in a healthy way, you should not go risk everything you have in a 100x leverage for one shot, that is the kind of greed that is bad and I would say stay away from that, however there is also a greed that is acceptable as well, like wanting more and more bitcoin, going into bitcoin heavily without making debt, those are nice kinds of greed if you could stay there.
There is a difference between ambition and greed, you are actually talking about ambition which is the natural desire to improve ourselves and our lives, ambition is good since it lead to great things, greed in the other hand is a never ending desire to get something and once reached to want even more, this is why it is discouraged because it never leads to anything good, at the beginning it may seem to do so because it has similar effects than what you see with an ambitious person, but over time you will see the difference as an ambitious person can have a healthy and diverse life while the greedy one only cares about still getting more and more of whatever they desire.