Well, "win" as a noun is a word from Old English attested before 1150 [1].
And as a word firmly in the language it has its own specific uses in comparison to "victory". It would be silly or pompous to call a win in a sports game a "victory," for example. It would similarly be out of place to call a victory in a battle a win.
"Congrats *on the big win" doesn't sound out of place.
"Team A was victorious" doesn't sound out of place to me (ESL) though. Also pretty sure I've seen victory being used in a sense of "destroying the other team" - but I'm not defending its use.
Like, "congrats for the win" or "big win".