You're conflating political and economic systems here. Capitalism is fully compatible with fascism. And it emerged out of and is an evolution of manorialism, the economic system used under european feudalism.
Not just compatible, but capitalism requires fascism because by default it alienates the person doing work from capturing the value via exploiting the variability in standard of living and environmental sustainability.
Economists call this “arbitrage” which is a fancy word for, “Someone can dominate you economically and you have no legal avenue to avoid it.”
Proudhon covered this thoroughly in “What is property”
