One thing I've been thinking about: it's only a matter of time before your friends load an AI assistant on their phone, and it devours every text message you have ever sent to that person, every photo you've shared together, every record of an in-person meeting. This makes me really uncomfortable.
That's what bothers me for years now in the context of contacts on smartphones. Maybe I'm making a mistake when thinking about it, but - if I refuse to share my contacts with let's say Instagram, but all of my friends share their contacts list which includes me, does it really matter if I decline to share or not?
Another part which bothers me is that I have lots of different personalities online. On most sites I use different usernames, and I wonder if there will someday be an AI which can match all the different online profile to a single person, even if different username are being used etc.