I know I can technically use any Chrome Extension.
I also think, however, that there must be some reason behind the decision to exclude from chrome-plugins.info some of the extensions available in the Chrome Web Store. I really don't think chrome-plugins.info maintainers choose extensions to include by rolling of dices. They declare they "collect just the best and working extensions and plugins", so they must have well-defined selection criteria.
Maybe the reason has something to do with those "critical points about privacy concern" which stand behind the Iron project itself.
Maybe it's just a matter of license.
Maybe it's something else.
I hope someone will help me understand.