DOTA has about 20 mil (+/- 2-3 mil) players around the world (minus China). It's been that way for quite a few years with minor fluctuations. China alone has close to 50 mil Dota players based on info on the Chinese e-sport sites. These of course are unofficial numbers as DOTA is a custom map. When Valve release DOTA 2, I am sure you will see some accurate numbers being released. It may not be quite as numerous as DOTA (since there are lots of lots of casual that play a number of custom maps, not exclusively DOTA). It will probably have similar numbers compare to LoL.
The competitive end though, DOTA 2 will likely be ahead of LoL. It's already that way with the two DOTA international hosted by Valve compare to this one.
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