My language has a lot of accented letters yet I never once in my life saw a legit domain with accented letters. If the company name is “mi piace la pèsca perché è bella” we just register “mipiacelapescapercheebella.it”
The local nic also forbids to register any domain that starts with xn–
I traveled in many asian countries and I never encountered a domain in hanzi/kanji/hanja