Because family or friends are always going to have them and share with you. In terms of effort, it’s still a lot easier to use free-to-you streaming services (even with ads) than set up your own Jellyfin, Radarr, Sonarr, and Jellyseerr stack. I can definitely see the appeal of a streaming stick that let’s you do that, is fast, and isn’t riddled with ads on the home screen. Hell, I might’ve paid for one if I knew it existed and had less free time.
Be sure not to create an open resolver, something commonly used in DDoS attacks. https://serverfault.com/questions/573465/what-is-an-open-dns-resolver-and-how-can-i-protect-my-server-from-being-misused#573471