This.
I consistently see Flat Earthers reference huge sums of money ($19 billion/year!!!; 52 million/day!!!1!), and claim that NASA keeps all of this money. What they fail to consider is the costs of the conspiracy. First, NASA spends much of its money on private/public contractors. These include Lockheed, Boeing, ESA, SpaceX, ULA, Aerojet Rocketdyne, etc. Billions are given to these companies to manufacture NASA's parts, and pay salaries. And, continuing with salaries, NASA needs to spend hundreds of millions of dollars to pay their own employees. NASA needs to pay for rocket fuel, to launch the rockets, maintain the facilities they use, fund research and development, pay for satellites, and so much more. The accusation that NASA could keep any of that money is ridiculous.
The point is, even if it did emerge that NASA had been lying to us all the time, we never went to the moon, the ISS is fake, they can't launch satellites into space, it's all a big racket.
Let's pretend all of that is true. That still doesn't prove the earth is round. What NASA and other space agencies are doing simply confirm what we've known for millennia, we're living on a globe.
Eratosthenes' famous stick experiment shows that. A possible alternative explanation is that the sun is much closer and nearer than supposed, but there are easy ways to verify that - take some measurements, do some triangulation. That is literally all they have to do.
To be a flat earther you have to start with the assumption that the earth is flat and then work everything around that. So when NASA come along and do their thing then that has to be explained away.
Although my satellite TV was working just fine last night, and that relies on a satellites which weren't put up by NASA
https://en.wikipedia.org/wiki/Astra_(satellite)#Manufacture_and_launchSo I guess they're "in on it" too?
Makes zero sense. And, to respond to the original post, I have no idea what the motive of any government would be to hide this great "truth" from us about the shape of the world.