So, in order for these two claims to both be correct, you need to have 100% funded an amount of 2BTC times however many players you hope will sign up. So it should be no problem for you to sign a wallet or wallets that hold 100BTC, since that would only represent 50 potential players right? Could you do that now?
I see where your going here and I appreciate asking for the validation. But no we don't have 100 BTC reserved for the welcome bonus, why? Because it is not a current liability. A player can't sign up, deposit 2 BTC, then turn around and withdraw 4 BTC. The welcome bonus is released through earning "TurnTrip Points", which is linked to play, and thus rake.
My statement of every freeroll, bonus, etc being funded is correct, I believe, since the welcome bonus is funded through rake, before it is released.