Comment by Uncorrelated

Scale matters. Using Photoshop took vastly more time and skill to pull off realistic images, limiting how many could be made. With image generation there's no practical limit. Some of it will be used for relatively innocuous purposes like making joke images for friends or menus for restaurants. But the floodgates are open for more socially negative uses.

If you're the only one in the world with an internal combustion engine, the environmental impact doesn't matter at all. When they're as common as they are now, we should start thinking about large-scale effects.