Yep definitely have a feature like that in the works. Where if > 50% active users vote to kick someone they're kicked out for 30 mins. Easy to do, just a matter of finding the time to code it :/
I didn't realize how new that was. Yeah I rely on the newest of the newest features. I check caniuse.com and if at least 3 major browsers supports a feature then I use it freely. Sometimes that means using stuff that doesn't work on older browsers or IE11.
It was originally vanilla JS on the front-end but I changed to Vue.js because it was really inconvenient without something like that. Vue has its own caveats but they're less annoying than nothing. The backend is a single free-tier EC2 server running a single Node.js process, using Websockets. Everything is custom except a canned websocket lib (and Vue).