I just got banned yesterday with the same results people have been posting here. Here is my story.
I never used shiverbot, but did experiment with some ram editing like chunks and super sea snails (which might have been the biggest flag).
My cfw switch can't connect to Nintendo services at all, and my second switch can use my account, but is banned from going online in splatoon 3.
I wrote to Nintendo and they responded with that the ban was permanent. Played a ton of the game and have around 200 hours into it already. Everything I had I could have got legitimately. I only edited since I was curious if it was possible and didn't have the time to grind.
I just feel kind of... empty inside, I spent a lot of legitimate hours into splatoon 3... didn't cheat or ruin the gameplay experience for anyone.
I've been a Nintendo Fan for years but this... this kind of feels like a big betrayal...
The real irony is that I never even used those super sea snails anyway, I could have just not experimented and not got banned... imo it's incredibly harsh and now it's like they've just wasted the money I paid for both the game and the Nintendo online subscription.
It's just... really harsh... just for experimenting with some ram editing, they've treating everyone with the same ban as if they used malicious cheats or technqiues online, or pirating a game. I can't believe my switch and splatoon 3 experience has been ruined....