The Financial Times: https://github.com/Financial-Times/tapper
Discord: https://blog.discordapp.com/using-rust-to-scale-elixir-for-1...
Pintrest, who seems to really like it (note the highlighted comment): https://medium.com/pinterest-engineering/introducing-new-ope...
And looking on https://elixir-companies.com/en I see two in the UK, two in Brazil, Amsterdam, Ukraine, Canada...Plenty there.