EG vs 100T was a banger LCS final and it didn't even cross 500k, that's low for LoL standards, it's close to dead in NA just like CS but the dominant region is asia rather than EU.
Yeah NA/EU/Korea/China is the 4 main regions and NA is regularly meme to be a wild card cause they consistently perform badly against wildcard/minor regions. I really think some of riot moves save league in terms of them choosing to go franchising for constant fan base. NA region isn't as interested in league but still get good viewership.
I think China Viewership is insanely high compared to any other regions, idk how reliable their websites are but yeah. Wildcard/minor regions occasionally surprise and take games but nothing super competitive. I missed back in Season 2 when TPA won it was pretty hype and really caught everyone off guard because they came out of no where.