It was back in 2013 when I switched to a job where I first heard work groups (or departmemts/divisions) to be referred to as "teams".
The mid-level managers who were using the word "team" were clearly meaning to convey that we, workers, should work together like players in a team sport. The vibe of a sport playground, the agility, the ability to feel each other's pulse and efficiently collaborate/play together towards a win was what they mostly wanted from us.
Those managers were clearly belonging to the majority population who passionately followed sport events, watched matches, used the slang in every day life, considered that to be a norm for most if not all (as oppposed to regarding it just as a personal passion) and hence got rather prejudiced towards / annoyed by those who did not fit in.
From their point of view, working as teams was the only right way of working: if you are not a team, the business is doomed. If you are not a team player, you've got to be fired.
That approach was rather distressing to me who 1) Virtually never liked or followed any team sport; 2) Came from academic/scientific background where people also worked together efficiently, but the manners and habits were totally different from those in a sport team: tact, poise, intellectualism, dignity etc. were there at play instead.
I did manage to cope / adapt so that eventually was not an issue.
However, in hindsight, I now wonder where did it all come from? And when? And just why now everyone calls work groups teams and workers team players?