When you

openSubscription()

you get a channel, which is hot and keeps observer until you close it.

However, when you convert channel to observable with

asObservable

it works just like any other hot->cold converter. The underlying channel is not closed, but you can subscribe to it many time, each subscriber receiving its share of events in fan-out faschion.

Long story short, when you

openSubscription

it becomes your duty to ultimately cancel it.