(Such scenes are in probably 75% of all movies. It is an old device for introducing characters.)
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!
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.
Just because it may be legal, doesn't mean it isn't creepy for someone to take a picture of a random other person.
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.