That's because Bing and other platforms do read keywords and image text whereas others don't. Sure they maybe smaller - but in this day and age - any and all traffic is good because search engines' algorithms "read" the names of your images, just like they "read" the text on your site.
As a side note, choosing the right images for your website is important. I always recommend not to name your images like 2345349a_34.jpg since google can't read numbers
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