AMD has the best iGPUs available, which (unlike Intel's) are actually fast enough to play a lot of games. They're also significantly more power efficient as a result of 7nm. For any use where this is fast enough -- and this is a huge percentage of the PC market -- nVidia has no answer to this.

AMD is the only option for a performant GPU with reasonable open source drivers. Intel has the drivers but they don't currently offer discrete GPUs at all. nVidia doesn't have the drivers.

AMD makes it a lot easier to do GPU virtualization.

AMD GPUs are used in basically all modern game consoles, so games that run on both are often better optimized for them.

They also have the best price/performance in the ~$300 range, which is the sweet spot for discrete GPUs.