Actually, I can honestly say that I've never noticed that warning- I haven't used Facebook much and only just made an account very recently. So EVERY OTHER page/app/whatever before this would come out to exactly zero.
So very sorry to be a Facebook noob. It's still a creepy warning.
Lol oops, sorry then. Yeah, it's concerning.
I think they (FB) were forced into alerting users of that and asking for permission after some semi-recent very serious concerns about their privacy.
Last I checked, they reserved the right to use your content however they see fit at any time without notice to you...for example a photo of you in a banner ad somewhere. As for independent content developers, well, they'll do whatever they want. I think for the most part they don't even pull any info out, it just asks anyway.