Screenshots are a suboptimal way to share code in general, and should be avoided. If you are trying to copy code from a screenshot something has gone horribly wrong in your process. If you are having trouble reading ligatures, that may be a learning curve issue you can adapt to with more use. (Arguably, most ligatures should be obvious with enough familiarity with the programming language without needing to look them up or learn them.)

Most other ways of code sharing you just copy and paste into a non-ligature font if you need to.

Aside: "ASCII" symbols are neither universally shaped or styled either. The easiest and obvious example to mind is the plain 0, dotted 0, slashed 0 choice and confusion with nearby symbols such as O and o and θ (Theta, not far away in "Extended ASCII"). Similarly all the variations of lower-case L (versus 1 and i). Those choices vary considerably between fonts and are another huge reason some people prefer certain monospace fonts over others and the debate over "best" will likely be an ever ongoing one. You may not think these issues compare to ligature use, but it's exactly the same sort of style debates.