Why Do Players Decline Rematch on 3 Min Games, Even When They Win?


Most 3 minute blitz players are in it for the dopamine rush.
They LOVE the thrill of winning a game quickly even if they won due to a mouseslip or blunder or network error.
They don't want to risk losing the next game to an opponent who is going to double-down and be more focused in the rematch. Much better to run away with a gold sticker than to risk losing to them in a 14-game match and not taking home a trophy.

I usually decline most rematch requests I get even I think the person I'm facing would be free ELO simply because I don't enjoy facing the same person multiple times, doing the same openings over and over, having the same play style. Unless I really enjoyed the game we just played I'm happy with 1 game (this doesn't apply to people I know)
For me I turn down the rematch if I need a WC break or cup of tea.