To run stable diffusion at home you have to download the model file, which took the equivalent of tens of thousands of hours spread across cloud provided GPUs.
If the model file just vanished from everyone's hard drive one day, and cloud providers installed heuristics to detect and ban image dataset training, retraining the model file would actually take decades for any consumer, even an enthusiast with a dozen powerful GPUs. The image dataset alone is 240TB.
Just to build my intuition, how long do you think it would take you to train Stabl eDiffusion in your homelab if you dedicated it to that task ? 10 years ? 20 years ? What about GPT-3 ?