It can still be used now, because there is no explicit rule that this character cannot be used. There are many more popular meme characters, such as xswl and so on.

But the only character yyds has been registered as a trademark by Luckin and "Waiwai Di Ace" is also in the application icon. After Ruixing's application is successful, others cannot use the entire sentence "YYDS Wai Wai Di Ace" as a trademark, nor can they apply for a trademark after changing the font or the visual arrangement of the characters.

As soon as this move came out, many netizens expressed their opinions:

"A hot word on the Internet is a hot word on the Internet after all. Register it, and those who specialize in registering trademarks What’s the difference?”

“Registering things from young people’s culture and selling them to young people?”

“Is this a term created by netizens? I have to ask netizens if they agree.”

“Ruixing has registered our own hot memes as our own. Will we consider YYDS infringement in the future?”

That's why this problem occurs.