What do flat Earthers think causes the "magical downward force"?

I have heard them say:

4. Gravity doesn’t exist - things are held down by air pressure.

If (2) was the case - then the acceleration would have to be EXACTLY the same everywhere - and it’s not.

Why do I have an itch in my labia, white gooey and thick discharge which doesn't have a smell but my vagina does sometimes and both me and my partner do not have STDs, what is it?

1. Gravity is real - but the Earth’s disk is very thick so the force is very nearly vertical.

If (3) was the case - you’d have the same problems as (1) - but this weir...

The trouble with (1), (2) and (3) is that these cannot explain why the force of gravity varies with height above sea level…less at the tops of mountains - more in valleys.

Lutnick Says He Expects Tariff Analysis on Aircraft Parts Soon - Bloomberg

3. Gravity doesn’t exist - it’s a form of magnetism that works on non-metals.

…and there are probably other ideas out there.

They don’t know - and not all of them agree that there is a “magical downward force”.

Pokémon Cafe’s new Mega Charizard curry plate is a work of art in more ways than one - SoraNews24

If (1) was the case - the center of gravity of the Earth would have to be so deep down to avoid gravity pointing off at an angle when moving towards the “rim” of the flat earth that the difference in height of a mountain would be negligible and we would get very, very nearly the same gravity everywhere.

2. Gravity does not exist - the Earth is accelerating upwards at 9.8 m/s2 which seems like gravity.