Strava looks great for some sport activities, but I’d like to meet other nerds into 80s computing, hobby electronics, comics, sci-fi, home automation, kayaking, city exploration, etc
You invariably end up with lical Facebook groups, which are just a flow of posts, and require a FB account, or some non local reddit group, or small scale website you have no idea exists.
Something is missing. It sure would require mass appeal to be useful, but a ‘Tinder for your hobbies’ might be nice. Get matches from people near you who enjoy a cross-section of the same stuff.
Add some social aspects for those who like to show off or share (don’t force it though), make discovery easy, let people organise events…