I bought second-hand Gamecube a while ago. I just checked and I have a cable which plugs into analog port. There is digital port too. I assume the digital port is used by component cable which I don't have. Funny, I've never noticed digital port until today.
Yep, you’re right. I bought my GameCube new back in the day and it only came with the composite cable. The component cable is a separate purchase and Nintendo only sold it in Japan. In addition to that, the Digital A/V Output Port was also removed from newer GameCube models¹, lowering the probability of someone wanting the cable even further.
