I understand it’s poorly promoted by the biggest users. But more of the web and world infrastructure runs on it than you realise.

Here’s an old post with some examples - https://www.erlang-solutions.com/blog/which-companies-are-us...

It's not being promoted much. There are no BEAM commercials during the Super Bowl. That is to say that there is no big company promoting it. Sun pushed Java hard, Google pushed Go, Mozilla pushed Rust and so on.

But those who know, know. I mean it's on the front page of HN pretty often.