Twitter/X is a company, it calls itself whatever it wants, and is likely registered somewhere under a specific name. Okay, people don’t call it X, the same way people pronounce IKEA weirdly or refer to vacuums as hoovers.
Language is a malleable, artificial construct. What’s your point? That some people are stuck in their ways? Because the comment I was responding to was appalled that someone dares use the modern spelling for a country.