I don't know what it looks like on the ground now, but Scala was the defacto language of data infrastructure across the post-Twitter world of SV late stage/growth startups. In large part, this was because these companies were populated by former members of the Twitter data team so it was familiar, but also because there was so much open source tooling at that point. ML teams largely wrote/write Python, product teams in JS/whatever backend language, but data teams -- outside of Google and the pre-Twitter firms -- usually wrote Scala for Spark, Scalding etc in the 2012-2022ish era.

I worked in Scala for most of my career and it was never hard to get a job on a growth stage data team or, indeed, in finance/data-intensive industries. I'm still shocked at how the language/community managed to throw away the position they had achieved. At first I was equally shocked to see the Saudi Sovereign Wealth fund investing in the language, but then realized it was just 300k from the EU and everything made sense.

It's still my favorite language for getting things done so I wouldn't be upset with a comeback for the language, but I certainly don't expect it at this point.