It does seem like a reasonable thing to be able to do, if the player is on bad terms with the Hegemony. Maybe as an easter egg option, if the player's Hegemony rep is low enough.
That said, the planet itself is not very good, and you can almost definitely find a better one within the first few months just by keeping an eye on survey missions. If it happens to spawn in a good system, maybe it's worthwhile to patch the game so that major factions will only enforce system claims when the player's colony is smaller than theirs, but I thought it already worked that way.