The new X logo has started replacing the blue bird on the web.
Twitter is transforming into X, as the site’s former bird logo has now been replaced by an official new X logo. Elon Musk, who owns the transformed social media site, began signaling the change early Sunday morning with a series of tweets, starting with one that said, “and soon we shall bid adieu to the twitter brand and, gradually, all the birds.”
Twitter replaced the logo after Musk requested for people to post logo submissions and that “if a good enough X logo is posted tonight, we’ll make go live worldwide tomorrow.” Musk then pinned a tweet featuring a video created by a Twitter user named Sawyer Merritt and changed his own profile photo to the new X logo. Musk did note that the new X logo is an “interim” one, so it could be replaced at a later stage.
US copyright law doesn't allow for protection of something like that. A dingbat, yes, but if it's very plainly recognizable as an X then the exact shape and output of that typeface isn't protectable. You can even print out a font, scan it, and create a new copycat font from it. The only thing you can't do is reproduce the actual typeface file itself, which is fundamentally a single copyrighted piece of software. Some other countries allow more protection on the shapes of individual letters, but I don't think you'd ever win a case anywhere on such a simple geometric shape as this X.
Not really; the XOrg logo is clearly designed in two parts, with a break between the two sections. It's absolutely reminiscent of it, though, just different enough that you can't really call it a copy.
What's even funnier is that anyone pretending to be the creator of the logo is a liar. (It is a scammer's website, after all.)
It's a symbol that's part of the "mathematical alphanumerical symbols" subset of Unicode since ~2001: 𝕏, also known as Mathematical Double-Struck Capital X (U+1D54F).