As someone who was pretty interested in sports I think for me it started as something to do, particularly outside of the house with friends. When I started gaining interest I was a young 20-something in a new place by myself. Choices I had to not be a friendless homebound hermit come to bars/clubs and sports mainly. You can find things like nerdy groups, but I tried that a couple times too and in my experience I didn't really like any of those people (too much left lean). There's also a lot of obsession there. I'm not into that level of obsession over things whether it be MtG or a sports team. So I ended up with some friends I liked going to games with. I tried playing some sports a bit too, and I did for a bit but the combination of years of being the worst player on the team and getting older and injured sort of did that in.

I've lost a lot of interest since 2020, but I'll still go to a game here and there for the same reasons. Even at the height of my interest though, I didn't watch much on TV but would just look at scores and stats after the fact.