Bitcoin is not like stocks it's more like gold or a commodity that someone has placed value in beyond its material value. When you say if you win someone else loses you need to give a concrete example of that. Because any fixed supply commodity the more in demand that commodity becomes the higher the price is. This does not necessarily mean anyone loses. If I bought Bitcoin at $1,000 or I mined a Bitcoin a long time ago and I sell it at the current rate, who exactly loses? The new owner of those coins can hold those coins and like any commodity it may go up or it may go down. So far the trend is it has gone up on average. So if the new owner holds it and sells it as a profit again who loses?
This is no different than gold. Sometimes gold goes up sometimes gold goes down, but on average it continues to go up because there is a limited supply. Markets are totally about timing. Gold is priced far above its industrial worth as a metal. Gold is priced currently where it's at because people have accepted it as a store of value. Bitcoin is priced where it's at because people have accepted it as a store of value. Like anything priced far above it's real world value.
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