@afreytes
And on the one hand, if everybody informs them, then the poster gets an avalanche of replies all about adding alt text, which is frustrating and even with the best tone and intentions can be off putting, but OTOH, nobody informing them means they don't learn about the feature (bystander effect). Even copying the image to add alt text yourself can be seen negatively (“stealing the thunder”).
So it's hard to strike the right balance.
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