You take a real photo, remove a stray object with a generative fill tool, post it, and Instagram adds "AI info" under your name. The picture is 99% camera, but the label says otherwise. The label usually isn't about the pixels.
Source: [Dev.to](https://dev.to/sebastian_balog_c88dc2913/why-instagram-labels-your-real-photo-ai-info-and-how-to-see-the-metadata-behind-it-4j0f)