icanttellyou

What are you even talking about? It says at the top of the post that this guide is out of date and you should read the new instructions right on the BetaCraft website

All they know is your username and IP.

Install latest dev build.

If on PC, don't maximize the window and simply move it towards the right. Anything else and you're not able to easily, so best might be to play on a PC.

Would you look at the time. *nothing*

Whack. Must be a bug in the macOS platform implementation and not something else.

Intel or Apple Silicon? Also plugins don't do anything in the launcher

You don't. Unless your reverse proxy service has a proxy it won't be listed on the server list.

Install updates and make sure TLS 1.2 is enabled.

I'm sorry what? Increased GPU usage from a server software???? Sure memory usage would increase but it shouldn't cause entire memory leaks as the logs are flushed to disk immediately.

What do you mean crashes? Do you have logs? What operating system are you running the server on?

You want to disable logs? WHY!?!?!?!??!?

Yes, ClassiCube supports all types of Minecraft Classic levels. Pretty sure you can also open Minecraft Indev levels as well.

In what folder is ClassiCube located at and what is its path (you can censor the username if it's in your user folder)? Because from what it seems it looks like it doesn't properly get the program arguments when launching. You can also try updating ClassiCube to see if it fixes the problem.

Not through headers but using the WebSocket specification to send compatible WebSockets