OK, I reiterate, which I am sure will annoy many people.
First, since some of the motives adduced to current advocates of a round earth (e.g., embezzling at NASA) wouldn't have been possible before the 20th century, WHY were governments and scientists and academicians promoting the "hoax" of a Round Earth before the 20th century? (The notion of a Round Earth was accepted by many - admittedly not all - educated people even before the time of Christopher Columbus.) So what was their pay-off (in the 15th or 16th or 17th centuries)? What was their motivation for maintaining the hoax?
Second, some of the motives supposedly operating now to perpetuate the hoax of a Round Earth don't make sense, in light of the fact that whatever profit the hoax may bring to a few it cannot spread to many. NASA officials might be embezzling, but there are many thousands of scientists worldwide who aren't getting anything extra for saying the Earth is round, and a great many retired scientists who aren't getting anything at all anymore for saying the Earth is any sort of shape - so what's their motive for concealing the flatness of the Earth? And NASA money only goes so far; what about all the scientists in foreign countries, even countries not on good terms with the USA? The same objection pretty much applies to any other attempted motive for perpetuating the hoax. The scientist who breaks the silence and comes forward with the truth of the Flat Earth will become more famous (and presumably more prosperous) than Edison or Einstein .... and yet nobody has come forward.