Let’s be honest, They won’t. The users won’t fund it, as they want to use it for free.
This is what happens when people say they will “donate” but will actually wait for others to do it and little to no one donates.
What you are seeing is the bystander effect. It is why projects like Nitter will end up raising capital from VCs as they actually have money.
Seems an unlikely investment for a VC. Xitter can shut down Nitter any time they want, and the end users don't want to pay for it.