Here's perhaps the dumbest thing about making the "logo" for 𝕏 a Unicode character: it can't be trademarked!
Anyone can use it on any app, website, or other publication without having to request use rights or pay royalties. Good luck protecting your brand, you idiot.
Maybe an expert in trademark law will find a flaw in my reasoning, but I'm not aware of any trademarks that are simply standard Unicode characters without any customization.