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People make side projects all the time that port "missing" software to new platforms, regardless of the reason that software is missing from that platform. There's a good chance OP didn't even know about the Epic backstory here.
It's only natural to think about rocket league for linux in a submission about rocket league for linux (now with the HN title reworded). Mentioning that this rocket league for linux is not a full replacement for rocket league for linux in a thread about linux rocket league is hardly ragebait and supremely on-topic. Unlike everything else in this sub-thread.