Modern flat-earthers believe that space is fake, that there's no such a thing. Thus, consequently, they don't believe that we are sending satellites to space, and instead they are just helium balloons. There are, of course, myriads of problems with that belief. One has to wonder why would every single country that has sent satellites into orbit agree on the exact same lie, and have been agreeing with it for as long as there have been satellite launches. Why would, for example, the Soviet Union agree with the United States to lie about this, even at the height of the Cold War (where especially the Soviet Union would have loved nothing but to discredit the United States for something they were doing.) Why would the millions of scientists, engineers, technicians, and every single person directly involved in designing, manufacturing and deploying the rockets and the satellites, agree to this, with not a single whistleblower? Seriously, if we indeed lived in a bizarro neo-Bronze-Age...