It can be a crime because it counts as child pornography, if there's an image of someone under 18, and it doesn't even matter if they took that image of themselves and shared it willingly.
Pode ser un delito porque conta como pornografía infantil, se hai unha imaxe de alguén  menor de 18, e non importa se tomaron esa foto de eles mesmos  e as compartiron voluntariamente.