And why not nvidia or amd, nvidia new generation seems to be delayed for ever, what is doing nvidia?, as you can imangine nvidia like apple or other major hardware manufacturers usually plan the development and the deadline to launch a product some years before the product is launched.
Nvidia and AMD could be doing the same as bitmain is doing if they find that mining is so profitable
I doubt nvidia or amd would do such a thing, they can charge more for gpus but mine with their gpus for profit? no, dont think so, they do mining tests but that is it.