Do the notificationchannels need to be created multiple times?

Question

I've always wondered if the application must call createNotificationChannel on every startup or to have they created once on first use is guaranteed to be fine...

I ask that because many tutorials like this: https://stackoverflow.com/a/5394210/5679560 suggest to do that during Application onCreate which means every start of the app

But, unless there is a way for the user or other app, manually delete the channel, I could simple create these channels on first app run

what is the correct approach