@Volpit I already have a personal policy of not boosting a post without alt text without doing this but nice to have a movement around it :)
Please also provide a standard snippet of text with instructions on how to edit the post and add the text to the image as not everyone might be aware. A link to a resource with more info would also help: https://www.sc.edu/about/offices_and_divisions/digital-accessibility/guides_tutorials/alternative_text/step-by-step-instructions-alt-text/alt-text-examples/index.php
And remember some folks may have legitimate reasons for not being able to write alt text.