My experience has been that "Windows 8 Apps" default to the 2x1 tile size and all "pre-Windows 8 Apps" default to the 1x1 tile size that displays their "desktop icon".
So the rule could be: "All apps start at 2x1 if they have a 2x1 tile designed, otherwise they start at 1x1"
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Except that they don't really obey those rules you laid out.
Minesweeper and Solitaire are double-width tiles, for instance. Why? Because MS wanted them to be. I haven't found another reason.
So why would developers choose to have their tiles smaller than everyone else's? Even MS didn't choose that.
My experience has been that "Windows 8 Apps" default to the 2x1 tile size and all "pre-Windows 8 Apps" default to the 1x1 tile size that displays their "desktop icon".
So the rule could be: "All apps start at 2x1 if they have a 2x1 tile designed, otherwise they start at 1x1"
The good news is that you can resize tiles to your heart's content:
http://www.addictivetips.com/windows-tips/how-to-resize-grou...