I wouldn't call it not legal, but it indeed can violate the terms many employees sign when they join a company. I think it's a matter of how they frame it. If t

I wouldn't call it not legal, but it indeed can violate the terms many employees sign when they join a company. I think it's a matter of how they frame it. If they frame it as actually doing some work for the company then I would say that would be illegal for many. But if it's framed as an interview then maybe it's OK. Not a lawyer, I assuming it's gray area.