Because this is all sci-fi woo woo and the honest truth is that we have no fucking clue how memory storage, learning, experience, or recollection actually mechanically work in the mind. At least relative to how an electronic device could interface with, let alone, augment or manipulate those mechanisms.

On top of that, our current system has proven time and again that you cannot trust an entity whose sole purpose for existence is to extract wealth from the resources around it (i.e. people). Not especially for something like this. It will need to be regulated, standardized, limited, and controlled by an external coalition.