This sounds like a great initiative. I can't find anything on the site about a privacy policy, how the email addresses you're collecting will be used. If you're creating this for the AI community, then how will this data be made available to others?
When we enable sign-in, we'll also add a privacy policy, because at that point, we will store some images, on request, to use them to make finding other works by the same artists easier.
Opt-out image URL lists will be made available to the dataset owners for removal. Opt-in image lists will be public.