because it is extremely easy to get ROMs for everything else.
With the DSi, you can simply toss any ROMs you want in an SD Card!
💾 SD Card ┣ 📜Super Mario 64 DS.nds ┣ 📜Mario Kart DS.nds ┣ 📜Mario Party DS.nds ┣ 📜Aura-Aura Climber.nds ┗ 📜Bomberman Blitz.nds
This example shows 3 Nintendo DS games and two DSiWare games, notice how all of the ROMs end in .nds
The Myrient likely does not have DSiWare in NDS format, but MarioCube does.
Quick Note: "DSiWare" is a brand of DS games that were availible on the DSi Shop, they are usually small games.
Erista hosts Myrient and a Nintendo 3DS ROM repositroy that has it's own client for 3DS called 3hs. 3hs can be installed via CIA with the FBI app. (just dont get NSA, heh.)
Yes, it is that easy, and if you have followed 3ds.hacks.guide fully you might even have FBI already.
The Wii U has a special Aroma homebrew app that can download games on-device, straight from the Nintendo Update Severs (NUS). This tool can also install local apps, useful for those who have made Virtual Console injects.
💾 SD Card ┗ 📂 wiiu ┣ 📂 apps ┃ ┗ 📜SigPlugin.wps ┗ 📂 environments ┗ 📂 aroma ┗ 📂 plugins ┗ 📜SigPlugin.wps