Beyond being functional and sharing a runtime I don't think Elixir and Gleam have much in common at all. Our recent developer survey showed that the majority of Gleam programmers were not Elixir users and largely were not attracted to that language.
> Our recent developer survey showed that the majority of Gleam programmers ... largely were not attracted to that language.
I must admit that I find that fairly bizarre. What do you imagine the source of that lack of desire is?
For context, my favorite language is F# and ML-dialects in general, but I also like what I call "principled" dynamically typed languages like Scheme, Racket, Erlang, and Elixir.
Gleam grows the BEAM ecosystem by bringing people in from elsewhere who were not interested in writing Elixir, Erlang, or LFE.
> I must admit that I find that fairly bizarre. What do you imagine the source of that lack of desire is?
They're just very different languages to work with. The programming experience is very different.