I was editing a text in vim and I typed gx on a play-button emoji to open it as an url and to see what happen. Vim translated the UTF-8 emoji into a punycode one and wrapped it into an url format for my browser: xn--g1h.com. The request had been redirected to another site: anti666.com, that it's quite spooky. The site is uncertificated, of course.
I tryed to wrap other emojis' punycode into the same url format (www.<punicode emoji>.com) with two different browsers (firefox and chromium) and I didn't notice any difference in results between them.
Sometimes I got 404 errors, sometimes it took me to other uncertificated sites. To take another example, xn--c1yn36f.com redirects me to 1redirb.com/.../.... I didn't tried further because I thought it could be risky.
I think these are redirections and not aliases or whatever because of my research with whois.com but it's just my own speculation.
My question is: How this redirections are possible and why this happens? Are these domains actually existing or there is another explanation? I expect my browser throws me an error, not redirects me to another unsafe site.
Thanks.