Let them explain why. And they will be trapped.

A 5-foot-tall object will completely sink behind the horizon at approximately 5.48 miles from an observer with an eye height of 5 feet. Sailors have long observed that ships disappear bottom-first as they sail away, consistent with the Earth’s curvature. For a 5-foot observer, the horizon is about 2.74 miles away, and a 5-foot object disappears at roughly 5.48 miles, as calculated. This is routinely confirmed by visual observations at sea. LIDAR and Radar measure distances and elevations, confirming curvature over long ranges. Simple experiments, like the Bedford Level experiment (when corrected for refraction) or modern laser tests over water, show objects disappearing behind the horizon at predicted distances. For instance, a 5-foot object at 5.48 miles should be fully obscured for a 5-foot observer, and tests with boats or markers confirm this. Claims that zooming in with telescopes restores hidden objects are false; magnification doesn’t overcome the physical obstruction of the Earth’s curve, though it may clarify objects near the horizon.

There's an even better reason why you can't see earth's curve and that's because it doesn't exist lol

Yup they break their curvature calculator that was written early 1900s in a encyclopedia lol 🤣🤣🤣 But they're explanation is you don't understand measuring lol,, well I do and I do measuring at my job 😂😂😂

"okay then that means the gIobe Earth is actually bigger than they s-say it is!!" they dont know the radius but they swear they know it's round 🤣

What would be the motive for a global conspiracy to hide the Earth’s true shape?

Nope, still does not explain the missing curve.