It lacks TSMC packaging capacity and CUDA-scale developer adoption, and its open source ROCm has little uptake. Its 3D packaging is more advanced than the H100's 2.5D, but the real threats come from customers and open source.
Bought ATI for roughly $6 to $7 billion in 2006-2007, giving Nvidia its only legitimate long-term rival real resources and distracting Nvidia. It remains a legitimate second place in high-end gaming and Nvidia's main competitor.
In the mid-2000s it tried to buy Nvidia, but the deal collapsed when Jensen insisted on being CEO. It bought ATI in 2006 instead and became Nvidia's main GPU rival.