Firefly! I adore the Wild West theme mixed with the sci-fi elements. Feels really unique, and it represents what the spacefaring future probably would look like to the average person. Like everyone else, I’m livid it only got one series, even after all these years.
(I even made a magazine for it: https://kbin.social/m/browncoats )
On the other hand, I’ve been on my fair share of sites that only need an email address to open an account - they don’t ask for anything else, and you’re straight in. Can’t think of any examples off the top of my head, typically, but they do exist. It’s weird.