"开黑啦" as a service has renamed themselves a few years ago, and their software is getting worse and the user base is consistently smaller than the tencent ones, we've been updating the url redirect since. We didn't change the button before because the phrase is actually not bad for indicating what it was for (translated to "let's play together")

I finally started hosting the join page myself instead of just using a DNS providers redirect. so it finally supports https now.

Rename the button to "join community" instead.

And I feel like we shouldn't just have a backbox url that one person secretly controls. So the page is now opensource here:
https://github.com/TeeworldsCN/join

You can check the current join page for CHN here: https://chat.teeworlds.cn