Altman might be a dick but anyone who claims ChatGPT isn't useful has either never used it or is a fool with an agenda.
The typical claim is not that "ChatGPT is not useful". That is just the dishonest propaganda version. The usual claim is that ChatGPT is not useful or outright harmful for a lot of the application scenarios claimed and only has limited use where it actually works, which is mostly improved search and text summarization. And even there it comes with the risk of hallucinations.
That sounds a bit different from what you just claimed, doesn't it? Of course, you being an AI fan may indicate you are not smart enough to see that difference. I recommend you take the statement I just made and have some LLM type Artificial Idiot explain to you what the difference is to "ChatGPT is not useful". Because while LLM-type AI is utterly dumb, it usually can perform on this very low level, even if you cannot.