but how? That can't really be illegal, else we would have to make illegal applying "online" altogether, so how exactly can it be fought?

By refusing to participate, but it only works if we all do it. As soon as an AI comes online during the interview process, disconnect. If _everybody_ did, they'd get the hint

(Actually, my great-grandfather was a coal miner in Tennessee. They also found ways to make the labor process humane)

It's a lawsuit waiting to happen anyway. It will use inflammatory language or ask invasive questions. Only a matter of time.