What this misses is all the regulatory capture that he’s been campaigning for. All the platforms have now closed their gardens. Authors and artists are much more vigilant about copyright etc. So it’s now a totally different game compared to 3 years ago because the data is not just there up for grabs anymore.
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
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