AI won't be designed to serve the users recommendations, but what is in the best interest of the person designing the AI. There was a pretty good article on HN about this, yesterday I think, that covered this well.

This is the thread: https://news.ycombinator.com/item?id=32482523

and it's well worth reading the article.

TL:DR; AI is good at something, but don't expect it to be aligned with what the user wants.