I am in a 1v1 game Small Earth, we are each in a team. There is a box that lets you "Treat Teammates as Enemies". Am I going crazy or that was always a thing?

i havent been playing for long but as long as i have, it is a thing

If the game you are talking about is with my alt it is because of you making it two teams of one.

^Multiple games, but yes. There are two teams of one.

https://www.warzone.com/MultiPlayer?GameID=34669398

This has existed (even in 1v1 games) for as long as i've been playing WZ 😅

Yeah this has been around for ages. It's useful if you are in a team game and (for example) your teammate controls a territory you need to complete a bonus, but you don't have a gift card.