If you are wondering why people seem a bit offended by your comment, it's because calling something vapourware has an implication almost of dishonesty or a con.
Crystal is real software that you can use today and build yourself and modify. It's doesn't make sense to accuse it of being vapourware.
This makes sense if you mean abandoned before release.
> "In the computer industry, vaporware (Brit. vapourware) is a product, typically computer hardware or software, that is announced to the general public but is never actually manufactured nor officially cancelled."
I'd hardly call a language with a fully-functioning compiler, a fairly complete standard library, which is being used in production in multiple (albeit small) companies as vaporware.
You should swing by https://elixirforum.com/ and see what's going on in the community. There are a lot of ELixir users who come from Java, OCaml, Haskell, Ruby, C#/F#, and further afield. It's a great language with a really sold niche in building systems with low latency, high availability, and good parallel data processing.