First, Welcome to the forum. Please stick to the standard fonts for the bulk of your posts, using big or bold or whatever for emphasis. Creating an entire post in giant bold font does not make your point any better.
They say the curvature can't be measure because the moon's tidal forces and gravity are constantly pulling and pushing on the Earth's surface distorting any measurements.
Who says this? Who is "they" to whom you refer?
Here are my thoughts or theories on the Flat Earth.
1. The 8 inches curvature squared for every Statute Mile either is incorrect or can’t be observed and therefore doesn’t exist.
2. Stars and galaxies staying in perfect alignment since the beginning of time with everything in constant motion at the speed of light and all while being unobservable.
3. Photos, videos, and data of our Sun, Moon, and Outer Space, in general being heavily edited, doctored, or just withheld.
4. The Secrecy about Antarctica useless frozen land mass. Yes, there our natural resources but the conditions are not feasible to be of any benefit.
Here are my thoughts on your thoughts:
1. "Can't be observed" is not the same thing as "doesn't exist" For most of human history the capability to observe bacteria had not been invented, but bacteria existed nevertheless.
2. Stars have NOT remained fixed since the beginning of time, nor even since the beginning of mankind's observations of them. (And none of them are moving at the speed of light, not even close.) The movement observed earliest in human history is precession, the movement across the starscape of
the spot around which the other stars appear to rotate. Today that spot is very near to Polaris; the illustration below shows the path taken across the sky. In 3000 BCE, for example, you can see the pole star is one of the stars in the modern constellation Draco (
Thuban, a star only 1/5 as bright as Polaris)
Observable by modern instruments on a much shorter time scale is the movement of one star relative to other stars. For example, here is Barnard's Star,
moving against the background of "stationary" stars (actually, stars moving as well, but much MUCH slower)
3. The statement that photos CAN be doctored is neither proof nor even evidence that they HAVE BEEN doctored. Also, the supposed ease with which the moon landings could have been faked? That's a lie too. It would have required film equipment and technology that did not, and even now DOES not, exist.
4. There is no secrecy; you can go there yourself. YOU specifically, Cherno Berserker, could pay for a trip to Antarctica. It costs a lot, but you can go. And ask yourself this: suppose there was a vast untapped region of natural resources. Why would the government(s) keep that a secret? Why not exploit it? Resources buried in the ground are worthless, it is only in their extraction that natural resources become valuable.