Well that's a strange thing I learned. When you get IP banned from a site, suddenly your API requests to the site fail. Why does this happen? Nobody knows. It is a complete mystery. Someone should make a game about that. A mystery game.
And technically speaking the site's continued efforts to prevent you from bypassing that ban could be construed to count as "them working on it".
I don't know how large this bank that MtGox uses
One of the three so-called Japanese "megabanks" (along with Mitsubishi UFJ Financial Group and Sumitomo Mitsui Financial Group)
To put it into perspective: the Mizuho bank that provides banking services for this unheard of nonentity you call MtGox among many (MANY) others is just about large enough that MtGox accounts for about five minutes of their volume. Every 25 to 128 years.