There's like three leagues in my suburban area, so I imagine quite a lot.

I believe there's zero difference between sports and sports other than audience size and length of time the leagues have been around.

Now a single streamer playing a single player game and mostly engaging with the audience? That's a different matter, and probably more like drive time radio than anything.

Literally like everywhere. If you were American you could replace that with baseball or American football or basketball, or from somewhere else it could be cricket or rugby or something. Regardless of where you are in the world, it'd be harder to not stumble into something sports related than to avoid them. You could go to wartorn Haiti 0.0001 seconds after a hurricane and an earthquake and there'd be groups of people playing soccer on the rubble.