Not that weird actually. The GTX 1070/1080 are in a category above the RX 580, the direct competitor is the 1060. They do have the RTX 2070 as a replacement for

Not that weird actually. The GTX 1070/1080 are in a category above the RX 580, the direct competitor is the 1060. They do have the RTX 2070 as a replacement for the 1080, that category is served. And of course a company favoring open source would lead customers to buy AMD, the free drivers are way better than what Nvidia is offering. So they set AMD where it is sound and Nvidia where AMD has no alternative on the market, and where for ML you'd currently want a Nvidia gpu anyway.