The majority of Chinese don't speak any western languages. A domain name of letters is no different from a random combination of letters to them, even if the name is composed of real words in English, Spanish, or French, etc. They are completely foreign. While a combination of digits is not, like phone numbers, zip codes, bus numbers, train numbers, etc. They deal with them everyday.
My parents don't speak any other languages other than Mandarin. [To be accurate, my mother spoke some Mongolian, and my father spoke a little Russian, when they were young. But they couldn't speak any of them now.] They have no problem in recognize and pronounce the 26 letter in English. After I have been living in American for so many years, they still can't spell my home address. They remember my phone numbers and my house numbers, though, but not the street names. Think about it. It is amazing. Because I find it is much easier to remember street names than phone numbers. Phone numbers are simply a random combination of digits, except the area code.