D&D 5e 2024 defines a monster as “a creature controlled by the DM, even if the creature is benevolent.” The definition for NPC also classifies them as a type of monster.
That means every PC you turned into an NPC for a later campaign grew up to be a monster
That means every PC you turned into an NPC for a later campaign grew up to be a monster
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It lends itself of a view of a fight being like a game or dance, where even if the combatants are on opposite "sides," them opting in inherently creates the conditions for the battle to exist
Because the other one seems basically meaningless.