FF7 Rebirth has reportedly sold half what Remake did in the same timeframe

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Both FF7 Rebirth and FF16 "heavily underperformed" as per wccftech. In response to comments about Square's expectations sometimes being unreasonable, analyst Daniel Ahmad also reports that "This is one of the rare cases where Square Enix is being reasonable, as both games really did underperform compared to past entries."

https://wccftech.com/final-fantasy-xvi-underperformed-disappointing-profits/#:~:text=Final%20Fantasy%20XVI%20and%20Final,Square%20Enix%20console%2Dexclusive's%20strategy.