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I know pro has no limitations that doesn't mean the game can handle 100000000000 ppl.
The planet earth can't handle 100000000000 people. 
The question of limits has far too many factors to give a useful answer. In theory, you can have an unlimited number of servers. Each server could contain 12 or 12 000 users (depending on what needs to be calculated for each user). So it could be unlimited, but after a while the cost of hardware will become unreal.
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