If you don't use proprietary plugins that require VSCode, then VSCodium [0] is a good choice. It has a better default config that removes telemetry.
> INSTALLATION AND USE RIGHTS. You may only use the C# Extension for Visual Studio Code with Visual Studio Code, Visual Studio or Xamarin Studio software to help you develop and test your applications.
If you don't care about the license restrictions you can add the offical extension store to VSCodium and it might work.
I really need to learn Kotlin sooner rather than later.
If you are looking for evidence that .net core is maliciously pretending to be open source to move to a language reliant on a JVM, I don't believe this would qualify.