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!