Curiosity out of your question.
I tot all android TV box today is cable to delivery audio via Bluetooth? Is there special audio standard such as DTS??

I have only try Bluetooth to handfree/earphones and also mini Bluetooth speaker with my boxes here - Old M8S, H96+ Pro.

Use third party app to replace YouTube.

Try AdAway (needs root) or what Fruitie says. But then YouTube ads aren't too nasty. Help content creators earn some extra buck. 

Smart Youtube TV.

Youtube Vanced.

Hi, we avoid discussing such in here. It's normal where live sports are concerned for service to be less than desirable in most cases. Going premium is advised. Since we can't talk about it, best is you get trial offers or just sub for a month on each service.. Test all to your heart's content and then choose that which performs best for you.
On another note, I'm letting go of my Minix Neo U1. Interested buyers can kindly PM me to deal. 

Which TV Box can support aotg beside minix?

There are a few now (Tanix, Mecool, HiMedia, etc).. due to the beta phase (very little restrictions). But once out and back to stable? we'll find out.. IMO, I'd still place my bets with Minix where Asterruk is concerned.
Get an Astro dish and decoder... Tell your friend.. That's his only solution.. Perhaps later when he can be more realistic and live among us, then he can consider ehem alternatives. FYI, we won't discuss such in here.. So there's that too.

Yes.

Sideload.

Try it and let us know.