When creating a Customer Journey based on a Subscription List and sending out an email for example, you are able to unsubscribe yourself from the Subscription List. However, according to Docs and my own experience, if the Customer Journey is halfway through, it still sends out emails to you until the Customer Journey(s) is/are complete.

I think this is really undesired and unexpected behaviour. The expected and suggested behaviour would be: if unsubscribed from a Subscription List, all Customer Journeys based on that Subscription List should stop immediately.