Reasons for using Restart in online games.

You should restart if your opponent clearly has a better position than you.

But how can you know that his position is clearly better? For that, you need to be a cheater. The fact that he bought more heroes on the first day of the game doesn't necessarily mean that his position is much better. Because there might be some hidden advantages or other benefits on your map that are not visible on the first day of the game.