Development of the eSports market

Hey guys,
as eSports is pretty much the only sport you can bet on right now (except maybe for table tennis in Russia) I did some research and was impressed on the actual offering. There are so many games and leagues these days with action around the clock, integrated live streams and live betting, etc. It makes me wonder why not more people are betting on esports. It seems to be still like some nerdy niche. Does anyone have some data like revenue, bets made etc. over time?
Would appreciate any thoughts on this topic.
Stay healthy,
AJ