why call it decentralized that s making it seem as if there was any 'centralization' or that that was the default. It's like calling notepad.exe 'decentralized'
If Google Docs was the only way most people wrote text then I think your analogy would indeed be apt. In this case, nearly all people using Large Language Models are doing so through a web page (ChatGPT) or an API.
That's the inspiration behind the name, open for something better. Considered "Edge" as well, but was concerned that would seem IoT/mobile specific.