The steam login popup that comes up is literally just an element on the page that you can move around, not an actual chrome window that gets opened, which is kinda interesting IMO. I can see how people might fall for something like this, since it looks like an actual steam login if you don't look super hard enough.
However, if you've been online in any capacity at all ever, and you have at minimum a double-digit amount of brain cells, then you should never fall for stupid phishing scams like this.
"Hello, You Play For MY Video Gaem Team, yes? We Win 5 Hundered Dollar United States If Win, Free Entry No Charg!e Sjust Sign Up At Website www.freegameLeageEpicCool.geocities.fart And We Ween Easy As Peasy!"