Is it bad idea to provide into Local composition the SnackbarHostState at top of the tree, so I can easily access it anywhere down the tree and easily show snackbars within app scope rather then screen scope?

Hey Vlad, I'd first consider trying to hoist the SnackbarHostState to the lowest common ancestor (https://developer.android.com/jetpack/compose/state-hoisting). If this doesn't suit your needs and you want it at the top of the tree, I wouldn't necessarily say its a bad idea. I'd personally look for a really good reason (requirement) to do so.