It's not whether they realize what it means as per the intent of the service provider, it's about what people think it means for other people. Since we're talking about an email service. I.e. I guess it's one thing to email someone in Germany from an <emoji>.kz email address and a completely different one to have customers (well, at least non-neonazi ones) signing up for such and address. Even if they do realize what kz stands for.