How is this "democratization"? OpenAI trains a model, then they make it available through an API. You have no say in what that model is trained on or how (other than to say whether they can use your data- but not how), neither can you modify the model according to your needs. And of course, with no ability to modify the product you're buying you have no opportunity to innovate. You can wrap it up in a different kind of application, sure, but the nature and number of applications that it can be wrapped up in is restricted by the abilities of the model and therefore is entirely dependent on the choices made by OpenAI.

Imagine MS saying they "democratised" operating systems because, hey, you can buy their binaries, so everyone can use their operating system. Compare that kind of "democratisation" with open source oSs.

No, the truth is that as more and more resources are necessary to wring the last few drops of performance out of the current generation of deep neural net models it is only large, well-funded companies that have the resources to innovate - and everyone else is forced to follow in their wake. Any expectations that progress would lead to "democratisation" of deep neural networks research has gone out the window.