Release it for free, no barrier to entry, no legal liability, the entire world can use it instantly. This is why free software spreads and catches on - precisely because it's free.
There is no way to form a business around FOSS without becoming a gatekeeping high-barrier entity. You can release for free then charge extra for consulting or special features, which many have done and continue to experiment with.
But the core reason why FOSS spreads and took over is precisely why it is difficult to fund. No one is going to pay for something when the alternative is free. And the moment you start to charge some free alternative comes along and your prior users spurn you as greedy