It's not like there is some central Bitcoin company so what is the brand? Brands are generally owned by companies and are intellectual property in the eyes of governments.
Unicode doesn't just contain things that are in use now and will be in use forever. It contains characters that were in use in one computer system once, characters for dead languages, abstract symbols that the next generation will barely understand, and more.
The Bitcoin symbol is used in textual documents today. It deserves to be in Unicode, or Unicode fails its goal of being able to encode any textual document.
Bitcoin may be short lived, but documents talking about it will not. Linear B isn't exactly widely used in new documents today, but it's still useful to have glyphs for it so that anthropologists can use them in documents about it.
As other people said, blockchain technology will outlive bitcoin. In this case I am saying "short" to mean a decade or so. I expect Unicode to last much longer.
I really don't understand the downvoting of an honest question. I am curious if he knows something I don't or maybe thinks short is some thing interesting like days or millions of years.
