i continue to hold the opinion that the only way you're gonna get everyone to use alt text is to actually integrate it with the experience for sighted users:
• all users should be able to interact with alt text easily, in a form that's friendly to font scaling and copy-paste
• it should be searchable (this is a *killer* feature — now you can find your old art/memes/photos using simple text search!)
• the alt-text indicator should never cover up part of the image, that's a huge anti-pattern