DRAW VS TIMEOUT VS INSUFFICIENT MATERIAL


Because you didn't win. Your opponent used up all his time but you weren't awarded the win because you didn't have enough material left to have won even if your opponent had played his or her worst.


The situation is the same by the official rules of chess. If you don't have sufficient material to mate, when your opponent runs out of time, the game is drawn. FIDE has a more forgiving implementation, where mate has to just be possible, while the site uses a simplified version similar to the US Chess implementation where specific material is considered insufficient.
https://support.chess.com/article/128-what-does-insufficient-mating-material-mean

Chess existed long before the clock became part of the game. To keep to the spirit of chess, the rule is that you have to have enough mating material on the board or you can never win.
This does not make the clock irrelevant. A single pawn is enough to get you a win if your opponent flags.