I think the thing everyone is forgetting is that valve isn’t stupid, there’s no way they didn’t realize you could work around accepting the (legally unenforcable) NDA, and it’s open invite.

Valve 100% knows that keeping it “secret” is good for hype and was expecting this to happen at any time, and the nominal ban was expected, but nobody is gonna get sued either.

More people are talking about Valve’s “secret” new game because of this than would be if they openly announced it.

The key insight is that the force a plane uses to move is independent of the ground, because planes push on the air, not the ground.

Imagine you put a ball on a treadmill and turn it on, what happens? The ball starts to spin and move with the treadmill. Now take your hand and push the ball backwards against the motion of the treadmill, and the ball easily moves in that direction. The force your hand put on the ball is exactly what planes do, since they push on something other than the ground (the treadmill) they have no problem moving, no matter how fast the treadmill is moving.

Plane on a treadmill is really interesting because if you understand how planes work its so obvious what will happen you don’t need to test it. Planes move on the ground by running their engines, which push against the air, the wheels provide zero motive force. It’s also why planes need tugs to move away from the gate, you can’t run the engines in reverse. Planes are not cars, but people tend to assume the thing they don’t understand works like the thing they do understand, and refuse to believe their hasty assumption is wrong even when told directly their hasty assumption is wrong.

If not friend why friend shaped?

It has the same root as the also made up word Cybernetics, hope this helps!