If the app does use certificate pinning, then you can use an Android phone and a modified app that removes the logic that enforces certificate pinning. This is more involved but also not impossible.
they "steal" access to data because the LLM launders it on the other end
https://academictorrents.com/details/89d24ff9d5fbc1efcdaf9d7...
I assume this must be only the text portion, and heavily compressed?
Llms know the contents of books because they are analyzed, reviewed and spoken about everywhere. Pick some obscure book that doesn't show up on any social media and ask about it's contents. GPT won't have a clue
What's your evidence contrary to this? Sounds like your common sense rather than inside knowledge
The entire English language Wikipedia is only around 60GB in a format that can be readily searched and randomly accessed (ZIM), for example: https://kiwix.org/
For the mobile app I used one of the smaller Wikipedia subsets, since I didn't want to take up too much space on my phone. The full offline Wikipedia download is saved to my laptop.
It is harder to prove to a "should have known" standard compared to say buying stolen speakers from the back of a truck for 20% of the list price.