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Re:Show HN: Use Slack Emoji on GitHub by andrenotgiant on Monday November 14, 2022 @09:20PM (#33604453)
No, Github proxies and caches images through an intermediary (probably for privacy reasons amongst other things.)
Re:Show HN: Use Slack Emoji on GitHub by 3np on Monday November 14, 2022 @09:47PM (#33604618)
I stand corrected, you're right! So seems to be 0 privacy concerns for viewers, here.

GH also seems to use the data-canonical-src attribute to reference the original URI.