Do you mean not actually open source because the OpenRail license (and this license) requires responsible use restrictions unlike, say, the MIT license, or beca

Do you mean not actually open source because the OpenRail license (and this license) requires responsible use restrictions unlike, say, the MIT license, or because this license requires a license for commercial use above certain revenue limits? If the latter, SDXL and SDXL Lightning is the best you get, and it's likely not far behind Playground v2.5 if you apply a finetune to output the Midjourney / Playground style.