Just because no one previously had a 20nm fab facility, does not mean that one has been built or is being built now. Of course if one was being built it would certainly be kept secret, until the announcement.
Oh, ffs! One does not just casually put together a 20nm fab, secretly or otherwise. It's a multi-year project with Very Large Equipment orders and
never goes unnoticed within the semiconductor industry.
Ever.
For that matter, creating a 20nm fab for in-house use by an ASIC Bitcoin mining hardware company would be unprecedented. And by "unprecedented", I mean "It's not going to fucking happen".
Seriously, use just
one tiny piece of the brain you were born with and think about what you're saying. Because from here, you sound like a blithering fucking idiot.
/out