I've actually heard of RAM sticks called RAM cartridges from time to time. Not often, but occasionally.
Dunno 'bout spoons, though. I could probably stick them in a slot in a computer somewhere, but I'm not sure the sticking of the spoon in the slot would actually facilitate any of the assumed transfer of data that would be on whatever storage medium I've spooned with my spoon. Spoon is a lovely word; thank you for mentioning it.
I take the view that the word cartridge is a very general term that can indeed be used more broadly than narrowly. And yeah, it does seem like a credit card might be able to be considered a cartridge on the outside, though a HuCard meshes with the definition much more neatly.
And let's face it. Almost any definition can be abused or misread somehow. That's the joy of language; that powerful specificity, and lack thereof, of concrete meaning. And no, TechWeb is not a self-appointed dictionary site. It's a self-appointed technology site (and publication source) that also happens to host, among other things, a brief tech encyclopedia. I honestly was just poking around there for shits and giggles and discovered I approved of their definition of cartridge.
But you're welcome to borrow my Tool Hat, if you like.