It is a disturbing disruptor meme set off by people with nefarious intentions to play on most people's lack of basic physics.

I suddenly started getting dozens of these mindless videos on Youtube some months ago.

There is one very simple proof against this stupidity - just before a lunar eclipse, we can see the shadow made by the curvature of the Earth. QED

The ancient Greeks wrote about this too - they couldn't explain it physically but they also could not argue against the geometry of it.