Not sure about CF but 5 Eyes is an information sharing agreement to get around laws regarding governments spying on their own citizens. So eg. Australia wants to surveil some guy but legally can’t. Well, they can’t help it if the US spies on that guy, right? And if the US later hands the Australian government an envelope with some information in it, that’s perfectly legal, right? And later the same thing takes place in reverse, quite a coincidence really.
https://windscribe.com/blog/i-doesnt-matter-how-many-eyes-yo...
https://en.wikipedia.org/wiki/Five_Eyes