No, it’s a registered trading name
Try selling a product or services branded as “MacRumors”, and see what happens…
Sure, technically it is, and I understand that. What I mean is that if they rebranded, the existing, so-called long-term and established users would almost certainly stay on the site, while new users would simply discover the site under its new name anyway. Changing the name wouldn’t hurt anything in this case. Quite the opposite, actually, I’d argue that when the average person is looking for a place to discuss something Apple-related, MacRumors isn’t exactly the most appealing name if you don’t already know what this site is about.