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> Looks promising, but what's the signup wall for?

Major turn off for me as well. Instant No.

Is an FPV controller any different than a regular video game controller? I interested in how hard it is to fly a drone even in a sim environment.

The left stick is generally used for throttle and is not centered with springs but rather adjustable and holds its position in the Y-axis direction.

Yes, one of the axis on FPV controllers usually is not springing back to neutral position, for throttle. This may seem like a small difference it is important.

You should be able to use the controller calibrator to calibrate a regular video game controller and use it.

Only use the upper half of the left stick per the spring issue folks mentioned above.

You can also use your keyboard or the virtual joystick if you are on a touch screen!