Don't make it easier to join. Having a technical barrier to entry, even a minor one, helps keep the idiots that ruined Reddit out. History has shown, repeatedly, that when technology is easy for anyone to adopt, then every idiot imaginable will use it and drag down the average, and the interfaces tend to be dumbed down and constantly reinvented to enable said idiots easier access. Then you're stuck with enshitification and "graphic design is my passion" feature and UI changes that nobody wants.