Even that I call into question; a lot of image generation stuff has open models, and new models being pushed onto HuggingFace all the time, and if HuggingFace is too centralized for you, good news, it uses git-lfs and lots of other entities can run that as well for free.
As GPUs get better I think we will see a rise of a lot of local-AI. The companies that I think will benefit the most are Nvidia and to a lesser extent AMD (eventually). I would agree that that's too centralized, we should probably have more competitors in the GPU space, but I don't think OpenAI will be able to monopolize AI as a whole for forever.