You'd think so, but imgur for example is literally in the business of serving images to a lot of users (and some videos, too) and yet they did not even implemen

You'd think so, but imgur for example is literally in the business of serving images to a lot of users (and some videos, too) and yet they did not even implement the vanilla libjpeg optimized coding it seems. And I am not just picking on imgur, they are just an example for today; other similar services didn't do much better last I checked, neither when it comes to serving optimized JPEGs nor overall page sizes either.