I think he wants to be Steam. He wants to grow to be a foundational pillar of the market. He is to a certain degree with Unreal Engine, but that's split with Unity. He wants Epic to be the top player. Might be ego/power more than cash, but it's still coming from a place of greed.

So maybe he wants to use mobile as the lever to make the Epic Store relevant, and suing the first party markets is the path to do that.

Or maybe he's just used to being the richest guy in the room and doesn't like to be pushed around.

Either way, I think it's misplaced to herald him as a folk hero. I don't think he actually cares about individual freedom. He cares about whatever is good for Tim/Epic.

Epic's got its own anticompetitive bullshit. They don't let you play their games on Linux. They make excuses about Linux being a haven of cheaters, but really, they're just trying to add friction to keep people from moving to SteamOS.