So is adding crappy DSi minigames into new DS games Nintendo's way of fighting

Piracy? It seems a lot of ds Flashcarts can't play "DSi-Enhanced" games, Like Assassins Creed 2 Discovery has some crappy Picture taking thing where you can put things on wanted posters, something no one will ever use.

A way of fighting piracy? No. Most of the newer flash cards can run DSi enhanced games in DS mode.

Are you kidding...?
If they want to fight piracy seriously they'd pull an Earthbound.