I too wonder if this project was just a way of generating work for those in the photographic printing industry? My widest format printer is the 600mm Epson 7600. If one assumes these one million photos are postcard size, ie. 150x100mm, then a quick calculation tells me I would need about 834 rolls of paper each 30 metres long to make those 1 million prints, not to mention the huge quantity of ink.
If I were to use Epson’s widest format printer, the 64" GS6000, I would need only 308.5 rolls to make 1 million postcard-size prints, assuming the rolls for the GS6000 are also 30 metres long.
It all sounds very crazy to me.
On the other hand maybe someone out there had some obsolete printing equipment and a pile of substandard ink and paper for which there was no longer a commercial use and which was therefore destined for the rubbish dump..