These takes are usually worthless because interest increases and decreases rapidly and today's #1 is next month's "Didn't make the Top 100." It's just common sense and I don't know why anyone thinks this is a metric that means anything other than "today".
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Making a huge subscription-only chunk of the game suddenly free-for-everyone will do that. Why is this fact never mentioned? The sudden influx was because it was free for the first time.