Upscaling is always a problem, no matter how you approach it - weighted neighbours of various sorts, fractals, vector transformations... they all do some things

Upscaling is always a problem, no matter how you approach it - weighted neighbours of various sorts, fractals, vector transformations... they all do some things reasonably well and look like poop at least half of the time. When Gigapixel AI works well, it works really well. When it's the wrong program to use, it leaves you no room for doubt about that.