1) It seems that once again, the Flat Earth proposals work well for someone sitting in their basement using deductive reasoning to dream up ways things could work on a Flat Earth. If someone traveled to say Fiji and wondered if satellites were fake, they should be quickly corrected. And they would see the sun circle the south pole not the north.
2) One thing I noticed when traveling was how satellite dishes point straight up (more or less) near the equator compared to the ones I often see that point almost horizontally (in the far north). It is stupid to put all these satellites directly above the equator unless there was a damn good reason for that.
3) Anyone old enough to remember what it was like before the internet knows how expensive satellite uplinks are. If you ever played any interactive games before the internet, the link was typically about $1000 a month. If this was just a conspiracy and the satellite uplink was not actually that, some entrepreneur would have undercut that price, unless the cost really did relate to satellites. Capitalists do not forego making money just to perpetuate conspiracies.
4) If telecommunications companies are now in on the conspiracy, I think the number of people in on the conspiracy must be getting to be the majority. If more people know the truth than the number that are being conspired against, I am not sure it counts as a conspiracy anymore. Only those people sitting in their basements are being fooled, and they probably don't have as much money as those working within the system anyway.
5) If the sun at 3000 miles cannot cover the planet with light all the time, a few TV towers nowhere near that high would do a particularly bad job. Especially something like GPS if light bends (so it can light the underside of clouds). If light bends, how can I figure out where I am?
6. I point my antenna almost straight west to the TV tower I get my signal from. (I use free TV so the conspiracy is not even making money off me for this TV).
7. This is relevant to the OP since all these things mean that if anyone gets out of their basement they will either be stubbornly sticking to a belief that disagrees with what they actually see or they will change their mind. Just like Baby Thork who did not know that correction lines are used to correct for the curvature of the earth when you are subdividing farm land, practical experience is all that is required to end foolish beliefs. Correction lines were required since Thomas Jefferson did not think about that from his basement when he first proposed nice square farms in the Western US. Thork wanted a reference since he was skeptical that it was even a thing. How do we know what we know? We leave our basements.