Why people truly believe that if they share their ideas, they might lose something?
Mostly, because they truly believe in the existence of money, while we live in a world that only the belief of money truly exists, not the concept of it.
The Main idea of money is mostly to be controlled by minds of those who have created the concept. And when you realize this you will free your mind to understand why open source, freedom of speech, and autonomous systems, have one thing in common...
They are here to free your mind from it's illusions, and that is why you choose the story of Robin Hood. (because as a child you already didn't believe in money.)
Let's add to this philosophy, the reason why we are all desiring to have an autonomous system that will trade without any supervision, because we are Mesmerized by the dream that one day, we will truly be free from the need of money.
And that day is coming sooner than you can imagine, as for all the wars, the pains of human struggle, and lack of unity is creating loving truth, that common contribution to all always had a greater outcome.

You don't believe that the markets are a zero-sum game? If wealth creation isn't your goal, then what brings you here to this forum? (no pun)

Dear Grant, your belief of whatever the markets are, is just a belief, it can't be proven in any realistic terms. But this is all Economic Theory... At the rate our old fashion minds are progressing, soon whatever you call markets will vanish into dreamland hobby.
And we are all here to play mathematical mind games, to fill in the time of no zero sum game, but the probability of taking the advantage when there is time for it.

Hello Tip.
It's obvious that we look with a different lens, which is interesting. With this being said I try to grasp your philosophical/spiritual take on at trading/economics/markets. What makes you think that market places (exchanges, platforms, etc) will vanish? And which factors will play role in this?