I run Home assistant on a Rpi3 and cast it through Nabu Casa to my newly bought Google Nest Hub.
My kids figured out they could say “turn everything off” and all lights went off. Nice. Unfortunately this also kills the Nabu Casa casting. Which I then need to restart. Is there some way of preventing this from happening? And preventing the kids from speaking certain words… Everyone else has failed. 
I don’t use casting, but I do know a bit about home assistant.
- Does casting create an entity?
- If it does, what domain?
If it does not create an entity, disregard me.
Got it working now! Yes, it creates an entity. 
This looks like a switch in Google Home device list. I realized this could be removed (not exposed) in HA but the casting would still work. After a sync and server restart the Google Hub no longer kills the casting just all “normal” switches.
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Yep, that’s exactly why I was asking. Good to know!