[dotnet00]

To be fair, a decent part of the current model for getting to the Moon does involve milestone based payments, with the general idea being that it's cheaper, more efficient and has fewer bad incentives than just endlessly funding until the desired outcome is achieved. IIRC pretty much everything in Artemis besides SLS+Orion is using a milestone based funding model (the lander, the space station, the various research orbiters and landers that started launching this year).