Such a law would basically make startups impossible. Not that that's necessarily a bad thing, I think the startup culture is pretty toxic. Just an interesting result.
With one hand it would eliminate the opportunity to bait and switch, with the other it would extend a supply of users who weren't busy feasting on someone else's bait.
The real question is whether you could legislate and enforce such a law in a manner that couldn't be circumvented with simple accounting tricks.
The real question is whether you could legislate and enforce such a law in a manner that couldn't be circumvented with simple accounting tricks.