Those are two different topics. BeMyEyes is a smartphone app which brings your camera and OpenAI vision models together. It is ment to be used to describe/OCR things in your real-world environment.
While alt texts could theoretically be replaced by a browser/screen reader functionality that asks a vision model to describe the image, it is a waste of time and energy to have each and every user do it over and over again.
Ah, sorry, got you. The aspect I think about with alt text is that AI is often better than a mediocre human effort, and it is improving all the time. Improving AI will improve the description of all images, even older ones, and therefore you might want to run the current AI on all images, even if they have existing alt text.
While alt texts could theoretically be replaced by a browser/screen reader functionality that asks a vision model to describe the image, it is a waste of time and energy to have each and every user do it over and over again.