Relative to other countries, the US has much more competive industries and space for new entrants to grow. In Canada for instance many industries (banking, grocers, telecom, media, etc.) are each dominated by a handful of uncompetitive companies that exploit consumers.
To be clear I know that the US has this issue too to some extent, but it’s better there than elsewhere.
The big reason I switched back to Nvidia was because I wanted to play with some local AI models, and doing that with AMD cards was quite difficult at the time (I think it’s improved a little, but still isn’t straightforward).