About that... seems to be very little 7nm capacity to make the damn things. AMD haven't exactly flooded the market thus far.There are cards specifically designed and targeted for that specific use case. There are special machines for this purpose, too.
Also, the Radeons have lower performance for that, so at least these should be more regularly available in stock.
Not sure they can scale up GPU production whilst consoles and CPUs are the main priority.
Think AMD GPUs will be rare as hen's teeth for a good while.