[Barrin92]

for starters because it excludes most languages. Add Python to the url at the top and it dwarfs everything else

More importantly though, trying to count programming languages by installations of individual packages doesn't make sense for languages that have multiple tool chains or are simply being installed by some other means.

script/curl based installations are extremely popular for rust (rustup), haskell (stack), clojure (leiningen) etc...

[Shadonototra]

I didn't include gcc/clang/python and some others because they are preinstalled in most distributions, so the data wouldn't be interesting

Best way to learn and correct mistakes is to be aware of them, thanks for your input, it's pretty obvious now indeed