I once wanted to join the NixOS Discord. But of course people just call it "Nix", so I googled "Nix discord" and followed the first link ("NIX Official Discord").

Some of the channels seemed a bit weird, especially one full of memes, somewhat 4chan-like. It took me a few minutes of reading (and a few gross right-wing memes) before I realized that the Discord I joined had absolutely nothing to do with NixOS.

The complete opaqueness of the process makes it impossible to know anything at all about the community you are about to join.