It hails back to the early days of the ampersand, from when it was basically still just Latin “et”: https://commons.wikimedia.org/wiki/File:Trebuchet_MS_ampersand.svg
Personally, I do like this font (Fira Mono+Sans), because it still looks professional, without being so boring that I get depression from looking at it.
But yeah, that ampersand is pushing it a bit, as I’m not sure everyone else knows that’s an ampersand…