Why bother using a product from a company that is notorious for failing to commit to most of their services, when you can run something which produces output that is pretty close (and maybe better) and is free to run and change and train?
Still, Stable Diffusion is losing the usability, tooling and integration game. The people who care to make interfaces for it mostly treat it as an expert tool, not something for people who have never heard of image generating AI. Many competing services have better out-of-the-box results (for people who don't know what a negative prompt is), easier hosting, user friendly integrations in tools that matter, better hosted services, etc.