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Meta already appears to hold the rights to 'X.' It could make Twitter's rebrand complicated.
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I just saw another post saying Microsoft is claiming to own the trademark for "X."
It's a trademark, though. X is too generic to copyright, and a trademark is more or less just a logo; which can be unique for all 3 or even more people who want to use "X." Just don't make it look like the others' logos.