I don't understand why they don't attempt it... Console non compete maybe?
Console non-compete is certainly a possibility, but I don't think that is it. I admit I have no knowledge of one, or lack of one, I can't confirm that.
But what I suspect is rather AMDs lack of relationships with the OEMs. Most of those chips get sold via pre-built systems, folks like us are a niche industry. AMD has lousy relatioships with all the various OEM builders-- Dell, HP, Lenovo, etc.
Yeah, you can find ~some~ AMD models, but the vast, vast majority are Intel-based. Part of that is dirty pool on the part of Intel (and they have been caught and convicted of it in the past), but I can't say it's all of that. AMD needs to build up those relationships, get their chips in more pre-built systems, and it will go a long way.
Now - you don't ~have~ to have that avenue to technically produce a chip like this. But the HBM substrate is going to be pricey, and putting a part out there like that into the enthusiast/DIY market does impact your lower-end discrete GPU strategy, which has long kept AMD afloat for years now. Trying to price it between all of those constraints and keep it profitable could be tricky.
But I bet if Dell or HP or Apple wanted to put out such a system, it would exist. Apple got Intel to do custom chips (Crystalwell), after all, and the console manufacturers got it, obviously. But it's a big risky bet to throw it out to the niche DIY audience that's mostly accustomed to going with a dGPU no matter what's on the CPU.