If I need to use an application scope, can I use GlobalScope? Or I need to create my own scope?

yes, you can use

GlobalScope

inside app-scoped components or

object

(singletons) for operations that don't require cancellation

Agreed. It's arguable what operations would neither require cancellation nor handling of completion (either successful or exceptional). It's somewhat similar to the discussions around the singleton pattern and (in)valid uses for it.

thanks folks