> Then you're telling me it not actually illegal?

There is a regulatory category called “Bait advertising” created under FTC’s legal authority related to deceptive advertising, and various legal causes of action (mainly fraud and breach of contract, but there are others) that each cover some part of what might be described as “bait and switch” in casual conversation. “Bait and switch” is something that different people will have different boundaries around and has no hard and fast definition.