That's news to me. I (along with many hundreds of others) was paid to develop Minecraft, candy crush and battlefield, yet last I checked, they all retain their copyright.
The other line of argument avoids that issue by arguing that you personally created the code with the help of a tool (like a compiler or camera), not just commissioned it
I don't think that necessarily anthropomorphizes it. We speak of monkeys as authors without calling them human. And really the legally important fact is that there was no human author. You can also treat it like CCTV footage which is generally not under copyright because there is no human author (even though most would hesitate to call the camera the author either)