This is quite an interesting tactic and is quite a lot for someone to earn which will get more people to subscribe to it.
I doubt he will come online again
It's been less than a day and you're already considering he won't come back?
Why is everyone worried about the BTC being escrowed?
It is not like is costing you anything if he doesn't pay.
If he doesn't pay you just unsubscribe from his channel.
Unless it's requested in the rules most people will unsubscribe if theydon't win anyway.