Instagram will use users' content to train it's AI
in.mashable.com
in.mashable.com
It does feel like a breach of trust in one sense when this happens, but you are handing over your data to another party based on their terms (although this shouldn't excuse players acting in bad faith, for example, using intentionally vague terms of service that give them the opportunity to do this sort of thing in the future).
Zuckerberg's comment is just as relevent today as it was then [1]; I suppose the loss of that innocence is one of the consequences (tragedies?) of the modern web.
[0] https://en.wikipedia.org/wiki/Trespass_to_chattels
[1] https://www.theregister.com/2010/05/14/facebook_trust_dumb/