While I don't like that a for-profit company uses the name "OpenAI" to develop models that are ostensibly closed (no source, no weights, and for GPT-4, we don't even know basic data like number of parameters); the authors of this website should really look for a different name. This is misleading.
Yeah, this is deliberately misleading. Note the use of "Open AI" vs OpenAI. I wonder if the aim is to provoke legal action over the right to use the phrase "Open AI" and have a "OpenAI isn't open so why do they get to call themselves that" discussion in court.
TL;DR activism is my bet. Or hoping for a settlement to avoid said discussion and transfer the domain, perhaps even more likely.
“Open AI website and services use Stable Diffusion for generations. By using our services, you are required to comply with the Stable Diffusion license terms.”