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Re:Slack Is Raising $250M from SoftBank, Others by xPaw on Thursday July 27, 2017 @05:14AM (#14863695)
Image embedding depends on the client you use really. For example The Lounge [1] can display information about links and show image previews like Slack does.

[1] https://thelounge.github.io/

Re:Slack Is Raising $250M from SoftBank, Others by LaGrange on Thursday July 27, 2017 @05:41AM (#14863805)
That's very different. In Slack, I, as the poster, can decide whether to show a preview (it might be pointless and take up space), and add metadata to it. It's also searchable by _anyone_ in the chat history. The uniformity of these features matters, and you need protocol support for that.