If it’s early release it’s a warehouse leak most likely that then gets dumped from a modded console (xci format). Some users convert xci to nsp for reasons unknown to me. Might be that switch cartridges have extra padding at the beginning/end that can be stripped to reduce file size.
Otherwise it’s just a standard dump from a modded console in either eShop (nsp) or physical (xci) format
There’s going to come a day where China releases some statement along the lines of “The United States continues to agitate against our development, but at what cost?” and it’s going to be the happiest day of my life.