Guys, I'll say you if I even get banned.
Now let's talk about the freeShop like app.
It could also be like Wii U USB Helper Launcher software for computer.
Who would make to help me to code it?
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In fact you only need a detectable installed Switch title for the exploit works. It could be from cartridge or eShop, it only need data corruption on it. The data corruption repair by redownloading the game is legit. There's no way to get banned by doing that, because the Switch wont know if you own the game or not while redownloading it. I think it will believe you own it because it's already installed on the console and that it couldn't surely check it's id properly.
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I think that it can't check the title id correctly because the game datas are not the same than it should be. Soit will simply redownload them.