The problem is that Nintendo is not consistent about NES palettes either. Their different emulators all have different palettes, https://emulation.gametechwiki.

The problem is that Nintendo is not consistent about NES palettes either. Their different emulators all have different palettes, https://emulation.gametechwiki.com/index.php/Famicom_color_palette https://emulation.gametechwiki.com/index.php/Famicom_color_p... goes as far as to suggest their latest emulator (the one that is part of Nintendo Switch Online service) has as many as 12 different palettes where the palette picked depends on a game. Nintendo did have NES-based arcade systems that used RGB, however the problem is that their color choices were really ugly.