Python had lambda in 1994. JS didn’t even exist then.
Face it - people use JS because the browser happened, not because it’s original in any meaningful way.
JS didn’t invent lambdas, it made them popular. Or is it just a coincidence that every major language that didn’t have them, adopted them after they got real use in JS?
I know JS gets a lot of hate on hn, but if you look at the history of a lot of modern pl paradigms, many of them got traction after years of ridicule because JavaScript brought them to the masses.