Capatilism is only possible when you steal value from someone or somewhere else.
I don't know about "Capatalism" but "Capitalism" doesn't require stealing value. All capitalism requires is private ownership of the means of production and using it to generate profit. If you're a painter and buy paint, an easel and some canvas, and use that to sell portraits, you're doing capitalism.
Most zoomers are anti-capitalist because they don't actually know what capitalism is, and can't really picture what it would actually be like in a different kind of economic system. Anybody who grew up after 1989 hasn't actually seen a world where any other economic system exists. Capitalism was an attempt to improve a world dominated by monopolies, with big tariffs and trade barriers, where workers had no freedom to change jobs and had to fight over the scraps left over from the wealthy. If that sounds like the current world, it's because we're backsliding from capitalism back towards mercantilism and feudalism. Not because capitalism sucks.