There was a scene in one of the Ironman movies. Tony Stark is at a party and his personal assistant is pointing out people for him. She is recognizing faces and telling him who is who before he talks to them. She is telling him their jobs and backgrounds. Just swap out the flesh-and-blood assistant for a service delivered to your phone. Why is the automated system so much more creepy?
(Such scenes are in probably 75% of all movies. It is an old device for introducing characters.)
Tony's personal assistant may have intimate knowledge of everyone at the party, but probably knows nothing about people outside the industry. And she probably spent a fair amount of time prepping for the party. So she's bound to an upper limit of what a person can reasonably do.
And his personal assistant is a person which is a building block that innately fits into society. Any given person has some level of morals and integrity which would limit what they were willing to do with their knowledge. And even if they don't, people can be brought to justice if they abuse their knowledge/skills or otherwise have some kind of public pressure used against them. An algorithm cannot be imprisoned or even really destroyed and doesn't care one bit what it's used for because it doesn't care about anything at all.
Some of these things seem inevitable, but that doesn't mean they aren't creepy!
That is massively different though, that is a subset of people that most likely were on an invite list before hand. Would be similar to social media recommending the friends you are already friends with in photos you upload. More of a convenience than anything else.
What you mention is any random person identifying any other random person (ignoring the creepiness of taking a picture of someone without their consent). And using that to track down identifying information about them.
It's the expression of unlimited power by tools more powerful than us, perfect vs. flawed in their realtime ability to judge and analyze you in real time. It a a shift further into a world totally controlled by perfect knowledge of all details about every person's life. I don't want to live in that world.
The difference is that at a party like that the people are public persons and used to being recognized. Many of them are probably business partners so he is essentially using his assistant as a CRM to do sales.
Big agencies have entire dossiers on their clients for the sole purpose of brushing up on your info before a meeting so they can come across as super friendly and high touch. Even your hairdresser probably does this.
Main difference being that it isn’t creepy to keep track of things you can’t remember when being friends with hundreds of people is part of your job.
(Such scenes are in probably 75% of all movies. It is an old device for introducing characters.)