I agree, but it's worth mentioning explicitly that the main driver of accessibility has been generalizability. The fact that LLMs are so effective at zero-shot and few-shot learning tasks is what made out-of-the-box API access practical for a wide range of use cases. Products like SageMaker tried to automate away some of the complexity of training bespoke models, but they're still way more complicated than using an off-the-shelf model.