The https://alt-text.org project is moving forward as folks from the community step up. We're still hoping to find someone with firsthand experience in browsing the web relying on alt text to join us.
A major impediment is funding, because we want to make sure they're paid. We're looking for funding, but it's early.
If you're interested in the project but only if paid, drop me a line, let's talk. I can be reached here or at hannah@alt-text.org
Boosts appreciated.
Alt-Text.Org
A library of alt text written by humans, in progress. Stay tuned for a roadmap.alt-text.org