this is going to be proven wrong real soon, professional diy chip fab is coming
We shall see about that. maybe some day i can start printing 25nm chips in my home... but then by that time we'd probably be using quantum tech..
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also gpu are stuck to their gaming purpose,
I think you're assuming that the 2 GPU companies aren't watching or don't care about this market...
its doable, just because no one sat down and focused on making a professional grade home chip fab yet doesnt mean it will take years to do so. diy chip fab actually already exists, ofcourse its nowhere near capable of 65nm or let alone 25nm.
if gpu makers do get into the game, there wont really be any difference to the end result of hashrate monopoly's. your worse off with gpu makers getting into crypto mining then having asic companys get involved.