I think its pretty big everywhere else in the world. People in South Korea use it for "muk-bang"(watching pretty girls eat a TON of food) and Chinese use it for gaming(most gaming channels with 10k+ viewers are chinese channels). I assume Europe has a lot of gamers live stream channels, but the number must be dwarfed by Chinese.

It's really interesting to see cultures evolving around this technology despite America's lag on adopting it.