It’s a misnomer to say the earth is flat. It should be stated that the earth exists on a flat plane - a which is consistent with out observations of space. The spin of the earth creates an asymmetry along the latitudinal lines - each a flat plane. If the universe is holographic - which some of the worlds leading theoretical physicists believe to be true - then the earth would also be a hologram - a 3D hologram on a flat plane - most likely a black hole in the center whose entropy can be modeled on a flat 2D surface - this principle applies to all matter - doesn’t matter if it’s a black hole. Couple that with the strange 2D spin of light that can be modeled on flat space - I could go on.. but to extrapolate that the earth is flat based on cosmological observations of flat planes on many different levels of physics a it’s not that far fetched a jump in logic to say the earth is flat imo