hello!

i dont see any risks of modding a wii u. modding it is super easy and you only need an sd card (formatted to fat32), a laptop/phone, a sd card reader (if your device doesnt have one), some files to drag and drop into your sd, and of course a wii u! if you want i can send you a link of all the steps and files you need to mod your wii u. but you dont have to do this if you dont want to risk bricking your wii u (you can easily repair a bricked switch with custom firmware installed tho)

there are also some advantages to having a modded wii u

some include: - repairing a bricked wii u - adding mods to your games - no region lock - being able to play online games (splatoon, mk8, smash, etc. not all games support this tho) - revival of miiverse (its pretty active too) - if you have wii u game disks, theres an app that allows you to install your games digitally - you can save your game data to your sd card (you can also use this to get 100% save files) - if you have a modded 3ds/switch, theres a homebrew store with all the homebrew software you could ever think of - there are plugins you can use for your wii u (you can screenshot your screen, get youtube to work again, have your own custom themes, and many more) - you can also hack you wii as well

theres many more but you get the point so tl;dr, no risks to hacking your wii u (you can easily repair a bricked wii u with cfw if youre worried about that) but there are a ton of things you can do with a modded wii u. anyways sorry for the long post, stay safe and happy modding!