You mean the system that had a terrible aesthetic that made it difficult to appeal to the public, the system that had double the royalty fees of its competitors, the system that used mini-DVDs that held only 1.5ish GB of data while its competitors used DVDs and DL-DVDs that can hold 4 to 8 GB of data, the system that had no focus on online while its competitors were starting to experiment with it and opening up services, the system that was terribly marketed because it had no idea what it wanted to be, the system that Nintendo actively fought against 3rd parties early on because they didn't want to compete with them, we're talking about that disaster of a system, right?
The Gamecube was easy to develope for, cheap, and powerful, but it had terrible design and marketing decisions, as well as internal pettiness and arrogance within Nintendo, that hurt the thing from succeeding. Sony pulled the Gamecube move with the PS4, a powerful, cheap, easy to develop for system and it turned out to be a massive success because they did the opposite of what Nintendo did with the Gamecube.