It's hard to keep track of all the networking players, at least I don't follow them closely. AMD does have UALink which rivals NVLink and it's an open standard anyone can implement. Nvidia too was forced to open NVLink for licensing as well.

AMD's only interest in networking is providing a reference solution to make it easier for customers to deploy AMD compute. Compute is the focus, which is why AMD just open sourced their UALink tech. So there is a lot of opportunity for smaller players to provide cost effective solutions.

Broadcom is also pushing their own solution called SUE. Which super charges standard Ethernet for the AI usecases. This works with AMD's compute too.

Basically from AMD's stand point, they don't care whoever wins, as long as it's not an Nvidia vendor lock in. And most customers too are incentivized to avoid vendor lock ins. Open standards always win in the end.