I didn't even know that was a possibility. That's cool.
You don't have to play daily to keep up the streak, you just have to get 0 stars or more (complete the puzzle). If you take a week off and come back and don't lose, you continue the streak.
I don't know how going back to old puzzles changes the streak.
His argument is: 16 hours daily use is not addiction IF THAT IS THE ONLY FACTOR. He repeats it again and again. But that argument is stupid, because it ignores the other well-known and proven variables of addiction. Does this behavior have serious effects on your mental and physical health? Does it interrupt your work and play? Do you have an obsessive need to do it? The list goes on.
Who put this genius in front of a microphone?