I have a very cheap TV package that includes something like a dozen, maybe two dozen sports channels. That's where I mostly watch soccer, but very rarely these days. I watch no other sport, and I pay for all of those channels because they come together in a bundle
I occasionally go on r/soccer purely for goal highlights
I used to use sofascore to keep track of games, but I don't anymore since I rarely sit down to watch matches. When I do want to find out when a particular match is, I will search on google
I do play premier league fantasy with a few buddies. We have our own league
Also, I don't think hn is the place to do research about people and their sports-watching habits, since most people here won't watch any sports regularly. A better place would be to go to some communities related to a certain sport and interact with the people there to find out how they do things; but also, if you're not into sports yourself and know a particular sport in and out and the culture associated with it, it's probably not the best idea to do a startup about this