Here in Illinois is Woodstock, at ~25,600 (2020 per Wikipedia). It was the town where Groundhog Day was filmed. There’s even some small road signs here and there mentioning it for the rare tourist who comes to see it. Smallest place in the state I can think of, though there’s smaller towns that have been used for movies.
Some upcoming off-brand Hallmark x-mas movie will feature local tourist trap town Long Grove IL, pop ~ 8,300 (2020 per Wikipedia). The director grew up near there so knew about it and thought it’d be perfect for his movie.
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.