The Entity is just a bored MCU Dormammu
I assume devouring universes gets old after a while. So he thought, "hey, why not steal the time stone, kidnap some randoms, put on funny masks, and play an evil hide-and-seek forever?". And when the survivors don't want to play anymore, he turns them into Mindless Ones — a win-win solution!
After all, the entity's realm is timeless, and do you know what else is timeless? Exactly!
E = mcu ∎
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Entity, I've come to bargain. *gets hooked and sacrificed*