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Bitcoin is Stupid and Does Not Deserve an Emoji (blog post)
(thedabbler.patatas.ca)
This is a most excellent place for technology news and articles.
It probably falls under faulty comparison:
https://unicode.org/emoji/proposals.html#Faulty_Comparison
Their guidelines change, and it’s possible these emoji were added with old guidelines. They can’t remove old emoji, which means specific buildings like Tokyo Tower🗼is an emoji, even if they prohibit the addition of specific buildings nowadays.