Scala still powers a lot of big data and distributed computing frameworks in Java ecosystem. In .NET, the counterparts which only exist for Akka really, are written in C#.
.NET has hardly any big product that is relevant for big data folks, and the ones that exist are equally written in C#.
The only well known flagship product was JET.com, meanwhile acquired by Walmart, which by now was rewriten most of it.
The lack of exposure in .NET ecosystem, not keeping to the story how to sell F#, first companion class libraries, then Web development, maybe type provideders with the World Bank example demoed to exhaustion, maybe machine learning (while Microsoft actually hires Guido and alongside Facebook brings performance improvements and JIT support), only C# and VB are default for Windows desktop workloads, nowadays in what concerns .NET 9, who knows what the theme is.
In Visual Studio 2024 full installation, how many C# workloads also support F# as an option?
It is basically CLI, class libraries, and those old Web projects from the "F# is great for Web" marketing phase.