[choudharism]

I don't know if that is what happens (and in my experience it does not - the receiving app takes its authentication from the source-of-cast).

Regardless, if it ever comes to that, we should ask for more as customers. It doesn't and shouldn't make sense if a paid / pro user had to watch an ad before casting (a fully supported functionality) to a new / unknown device. Corporations are fully allowed and equipped to make money, but the benefit of doubt in unexpected / grey situations should largely be with the user. The alternative allows any entrenched party to arm-twist users for even more money, and while market forces cause an eventual course correction, the interstitial generation has to suffer along the way.