As I said, it costs nothing to dismiss.
Fly from London to Cape Town, and take groscope with you. You'll need a battery and a small air pump to keep it running for the 14 hours flight. You can get second hand gyroscopes used in the planes and then DIY to supply it with air.
Lock the gyroscope at level and start it. Then unlock it. When you've landed at Melbourne look at the gryroscope. If it's not at the same level when you unlocked it in UK, then the earth is not flat. If it's level as set, then earth is flat.
Gyroscope is fixed in space when spinning at the required speed, and gravity has no affect on it. It can easily handle 10G+ force and not budge. Earth's gravity is too weak to change the angle of a gyroscope.
Or if you can't be bothered to experiment yourself, ask any pilot how many times they adjust the gyroscope during a long haul flight (or even a short one) for curvature.
Or get in the car with the gyroscope, and drive 550 miles (straight line distance) from from Dover coast go Thurso coast (Scotland). At Thurso coast you will be 50kms+ below horizon (from Dover). And gyroscope should reflect that massive change. If it doesn't the curvature doesn't exist.
Distance Curvature
1 km - 0.00008 km = 0.08 meters
2 km - 0.00031 km = 0.31 meters
5 km - 0.00196 km = 1.96 meters
10 km - 0.00785 km = 7.85 meters
20 km - 0.03139 km = 31.39 meters
50 km - 0.19620 km = 196.20 meters
100 km - 0.78479 km = 784.79 meters
200 km - 3.13897 km = 3138.97 meters
500 km - 19.6101 km = 19610.09 meters
1000 km - 78.3196 km = 78319.62 meters
Now quickly come up with something clever to dismiss this simple experiment and it's potential result.
Other than NASA feed, is there another?
Apparently there are thousands of satellites up there yet only NASA feed is live. I have not come across even one live video feed from an unmanned satellite. Do you know of an on-demand live feed?
The question is simple.
Can you see the stars behind the sun? Apparently, you can only see stars from the dark side of the earth. However 6 months later, when the earth is on the other side of the sun, why do you see the same stars at same angles you saw 6 months ago from the then dark side - when these same stars should be behind the sun during the day time 6 months later?
Maybe our galaxy (or heck, even the universe) orbits aligned to the dark side of earth to give us the same view irrespective of the side of the sun the earth is at any given time of the year, right?