They consistently undersell their product. ChatGPT was released silently, with no marketing more than a tweet. GPT-4 was just a blogpost, despite how much of a scientific leap it presented for mankind.

Compare this with Google, which on the release of their inferior chatgpt, proclaims the "GEMINI ERA". Which is the typical marketing approach of exaggeration.

Since OpenAI undersells, even a random tweet will be interpreted as the coming of AGI. Since Google oversells, even their impressive achivement (Gemini 1.5) gets no hype and is quickly forgotten.