What do you think “it’s an algorithm” is supposed to imply? Can nothing deterministic be considered intelligent?
Also, “designed in a black box” is misleading. It’s opaque because it’s emergent behavior, not because it was obfuscated or designed in secrecy or something. The algorithm itself is simple. All the interesting data is encoded in the billions to trillions of input parameters. These parameters aren’t designed at all, they are learned.