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And yet, nobody has done the same for Twitter until now.

The difference is that twitter applies a series of operations to all uploaded image, stripping EXIF data, recompressing, etc., which would normally be difficult to work around.

Did people do this back in the day? 4chan used to be totally fine with just uploading a jpeg concatenated with a zip, but I haven't seen this ICC profile trick before today.

Well, 4chan served you the original file, so you didn't need to evade image processing at all

There is actually a greasemonkey script that lets you embed encrypted messages into pictures uploaded to imageboards, letting you carry on a side conversation this way. https://github.com/desudesutalk/desudesutalk/wiki/How-to-use...

I suppose you're referring https://en.wikipedia.org/wiki/Steganography

There are lots of apps/software to do just that.

I recall discovering apparent image files that had a rar archive appended. Not sure if it’s the same method.