I bought xn--mn8h9e.ws a couple years ago just for fun. I think it's fun to own an emoji domain, but what I can say definitely say is that it's still a bad idea to own one if you want to get emails to it.
Popular thick email clients still struggle with utf8 domains and I've fiddled around with several email providers that just have complete failures trying to send as well.
I tried pasting the email address in a bunch of popular services (LinkedIn, Instagram, etc) as my email or the domain as my homepage and most of them treat it as invalid, and I found some legitimate breaking bugs in their services in trying it out.
Edit: case in point, just noticed HN also falls in the camp of unsupported emojis in the text body, so another example :). Added the punycode instead
Popular thick email clients still struggle with utf8 domains and I've fiddled around with several email providers that just have complete failures trying to send as well.
I tried pasting the email address in a bunch of popular services (LinkedIn, Instagram, etc) as my email or the domain as my homepage and most of them treat it as invalid, and I found some legitimate breaking bugs in their services in trying it out.
Edit: case in point, just noticed HN also falls in the camp of unsupported emojis in the text body, so another example :). Added the punycode instead