Normal computer programs only look intelligent in very narrow areas, like number crunching, which is why we don't tend to call them intelligent. Their general intelligence is next to zero. Even if we were delusional enough to think life came from non-life and developed intelligence by random chance and natural selection, you have the same thing there where you get much more non-intelligent output than intelligent output. Monkeys on typewriters could also look intelligent some of the time, but looking at the totality of output they wouldn't.

It’s just an expression of plain old human intelligence

All artificial things are expressions of human behaviors. That's kind of the definition of artificial.