The DSi was definitely a popular console, but not too popular, and the hacking scenes back then weren't nearly as big as they are now. Most of them had their focuses on the DS, as it was still very popular, and flash carts were enough for people at that time, because they did almost everything that people needed them to, in loading games, etc. Nobody really payed a lot of attention to the consoles hacking scene, and the most it got were some flash carts, etc.