"HDMI" is a trademark. You can't claim to offer HDMI in any of your products.

The patent pools around approximately all the codecs used for media delivery are heavily cross-licensed. That includes HDMI and HDCP, but also h.264 and h.265. Most likely AMD can't legally use hardware decoding or encoding of any popular codecs at that point. Good luck with game video, streaming, or playing media discs.

So it would cost AMD - for example - their entire PlayStation/XBox business. At a minimum.