On top of that, the only supported cards are radeon rx 6x00, as if the 10 miners who own these cards around the world even care about writing GPGPU code :)
The RX 6000 series will have been out for a year tomorrow. I was able to grab one within a week after the release just by checking online stores a couple of times each day so while they did keep going out of stock, there was new stock coming in too.