Why is the Sky Go App multiscreen?!

[Sameeee]

Whenever I try to watch House Of The Dragon on the first day a new episode launches, at best I get buffering video, at worst I get a blue screen (of death). 
i thought, as Sky Glass is, following an update, quite unstable (I have an amazing internet connection and never have issues on any other device) I'd try streaming the show from the sky go app on my AppleTV 4k which is plugged into my Sky Glass. Oh sorry you can't do that without paying £10 a month for multi screen. How is it multi screen if I'm playing it on my Sky Glass?!? It's literally the same one screen. And i'm only attempting to watch in such a ridiculous fashion because Sky can't manage a steady stream on premier days. This isn't really a question. More a rant. £10 a month to watch an app which I'm already paying for is digesting. 

[TimmyBGood]

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@Sameeee wrote:

How is it multi screen if I'm playing it on my Sky Glass?!? It's literally the same one screen. 

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Nope: it's the Apple TV box as source device which counts: the Glass television is just acting as a monitor, as any other television would.  'Multiscreen', 'Multiroom' and 'Whole Home' are all marketing labels meaning 'multi device'.