I figured the actual reason was that the developers just didn't have time to make a Quidditch minigame in addition to everything else going on in Hogwarts Legacy. Some suggested that it could show up later as DLC.
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Turning in Sebastian Sallow Has Big Consequences in Hogwarts Legacy. Turning in Sebastian will result in his being expelled from Hogwarts. As a result, he won't be available in quests at the end of the game and won't be in the epilogue.