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why launch by itself doesnt exist
for example when you say launch{} it says `unresolved reference`

If you just `launch` "by itself" then you have a resource leak: You now have a coroutine running but nobody will take care to shut it down.
You always need a `CoroutineScope` to ensure that resources are properly cleaned up.

Some resources:
<https://kotlinlang.org/docs/reference/coroutines/basics.html#structured-concurrency>
<https://medium.com/@elizarov/structured-concurrency-722d765aa952>
<https://medium.com/@elizarov/structured-concurrency-anniversary-f2cc748b2401>

You can launch things globally, but you have to be explicit about it: `GlobalScope.launch`.