These are public domain images that anyone can use, modify, or place in VRChat worlds. There is an optional [unitypackage](https://gist.github.com/Purpzie/8338fb6c3204bb2f926f0e04c9397eb1/raw/164b2308c22919f571aca9a7631506e7ce400084/NoAIPoster.unitypackage) for the poster that opens the group when clicked.