>The second biggest use is Apache Spark/Kafka, but with LLMs now, you can pretty much re implement all of that functionality in pure C.

Spark is written in Scala, precisely because distributed systems are best modelled as a set of pure functions with minimal references to state. This is also why part of the reason why it's ascending successor, Polars Cloud, is written in a functional language, Rust, rather than C.

Android development is also increasingly being monopolized by Kotlin, not Java.