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That’s pretty much how it is. In ancient times, planets would have been objects that were distinguishable from stars in ways they had the ability to differentiate from. For example, with a telescope, any object that doesn’t shine like a star, that moves across the sky at a different rate than the stars, or maybe has visible rings.
Then once science found things that past science couldn’t account for, they redefined what a planet was, according to its size/gravitational pull or other factors, and which Pluto didn’t fit. Apparently due to Pluto’s small size, it’s not even a dwarf-planet, and by that measure is basically just a really big asteroid (we even know of asteroids that are bigger than Pluto).
Even if it’s not an MMO, player count can be a very strong indicator of enjoyment/income at a given time. Even if it’s a single player game, player count can show how popular a game is on whole. If a 5yo game still has engagement numbers above newly released games, it’s strongly correlated with studio income/gamer trends.
They can base future decisions on what they did correctly/incorrectly, and develop their next game/dlc/etc with those lessons learned.
Release a game that has nobody playing after a month? Crapbasket. Release a game that has well into a million players despite the age? Fucking masterpiece.