Lets have some theories as to what the conspiracy could be about.
To come back to the original topic of the thread, I think people assume too much when they see the word "conspiracy".
In the 17th century, Galileo Galilei promoted a heliocentric world view. He was forced by the church to recant his views. As most round Earthers also promote a heliocentric world view, they must believe that there was a "conspiracy" in place to keep people from believing in a heliocentric world in the 17th century. So what is the problem with a similar "conspiracy" today to keep people from believing in a flat Earth? Whatever reasons the church may have had in the 17th century to keep Galilei from spreading his ideas may be exactly the same reasons that today's governments have for letting people believe that the Earth is a sphere.
I personally don't actually think that a huge conspiracy is necessary. Throughout human history, the majority of humans have believed incredibly stupid things without a cabal of puppet masters behind the scenes to pull the strings. I think the number of people who have to be willing to actively conceal the thruth can be surprisingly small.
you fucking moron, then why spend billions on a 'fake' space program? get that through your piece of shit of a brain. why doesnt someone fly to the edge and see then unless they are in on this 'conspiracy'. a new level of stupidity has been reached by you. good work.