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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's a specific type of thing, but it's not a brand. Nobody owns the trademark for Bitcoin. Anyone can buy, sell, or mine Bitcoin. It's no more a specific product than dollars are a specific product.
Is there a problem with that? This isn't "advertising", these are unicode symbols. There are unicode symbols for all kinds of things. Every currency has unicode symbols, why not cryptocurrencies?