...
1. manufacture their own full custom 28nm chips
...
There are three i can think of, though Active Mining is not one of them.
A few companies meet _one_ of four criteria.... only one....
The point is Active Mining
does not meet this crucial criterion.
Active mining
does not manufacture 28nm chips.
Other companies do, Active Mining
does not.
Active mining doesn't manufacture *anything*, unless you count broken promises as its products.