Suppose in 2008, in the middle of the credit crunch and bailout talk, an anonymous crypto expert had publicly offered to cure several of the world's monetary problems with a new currency much like Bitcoin.
Suppose, however, that he/she/they had made this offer contingent on a promise to pay US$10 million in tax money if the plan were to succeed. Leaving aside the unlikelihood of TPTB allowing such a measure to come to a vote, would you have voted for the tax? As for me, perhaps yes, $10 million seems about right, given the time and effort needed, plus a risk premium of a few hundred percent.
Now suppose the offer had been for $100 BILLION (1011) rather than $10 million. I don't know about you, but I would draw the line well below that figure.
The example is not analogous to rewards earned through voluntary transactions. Taxation involves coercing those who disagree with a particular proposal into accepting it and contributing funds towards the project. In the case of bitcoin, or any other project/venture where participation is non-mandatory, those that invest see a benefit for themselves in doing so.
If during the credit crunch, an insightful fund manager offered investors a way to increase their returns in the midst of the market crashing, and investors moved their money to that fund, he/she would be expected to gain enormously. If the fund manager were able to produce returns of $2 trillion, they would see tens, or even hundreds of billions of dollars in profit. The investors wouldn't be discouraged from investing by the fact that the fund manager is profiting, because that fund offers them the best return on the market.
If bitcoin offers the best return in terms of greater convenience for someone going into cryptographically secured p2p currency, due to having a first mover advantage in creating a network, that is all that matters to someone who wants to use a digital currency.