All systems allow exploitation. Capitalism helps that exploitation to be mutually beneficial. It rewards greed for both parties. The owners work harder than you realise.
No, not all system allow exploitation, you saying that they do is another big fat lie. Bitcoin with PoW is not such system, Communism is also based on this same PoW principle.
Sorry to say it, but you just don't get it. This is such simple logic & easy to understand but you keep on thinking your things that are brainwashed into your mind.
Bitcoin doesn't exploit work of miners at all, every miner gets paid FULLY for work they have done. Person working for capitalist gets paid much smaller fraction of the work they did.