Seems that the Switch domination in Amazon ES reflected in the best sellers of june 2018.
6 of top 10 were Nintendo Switch games.
http://www.aevi.org.es/la-industria-del-videojuego/los-videojuegos-mas-vendidos/
Same for France last weeks, where 4 of the top 5 were Switch games (usually Switch has 4 or 5 games in top 5)
http://www.sell.fr/
Seems that, except for U.S., in the others country Nintendo isn't overestimated in Amazon. It's just really selling well.