A perfectly-normal program that might only load/run on a Google Cloud TPU or a Titan V, mind you; and probably one held together with tape and bailing wire (hardcoded paths, "works on my machine", an undocumented and unreproducable build env, etc.)
Y'know, the same reason that the "perfectly normal computer programs" that generate the data for scientific journal papers aren't usually published.
I understand that some networks might require the compute power that you mention, but this just seems like an average CNN mapping images to Disney characters. And I don't have much experience on that front, but like qayxc said, this should run fine on consumer hardware.
And yeah, many journal papers suck specifically for the reason that their results are not reproducible.
StyleGAN of this size runs fine on your average CPU.
I know that for a fact since I wrote paint.net plugin that does exactly that. Said plugin works perfectly fine with images of the size they use (512x512) and generates output (CPU-only, mind you) in less than 5 seconds on a dual-core laptop...
Y'know, the same reason that the "perfectly normal computer programs" that generate the data for scientific journal papers aren't usually published.