I spoke at a Clojure conf a bunch of years ago, I remember thinking “Wow this is a big room.” But afterwards I got talking to an event organiser about what they had to do for the Scala version of the same event…
I remember going to monthly "Hack The Tower" Clojure and Scala events at one of the big London financial institutions back in 2014. Both were hot languages but you could see by the presence of recruiters that employers were only interested in Scala.