alt Hacker NewsWell, no, because CAN take isn't the same as WILL take.
Changing something to an rvalue means it'll now match a move constructor, but there is no guarantee a move constructor will be used, even if defined, because you've got classes like std::vector that are picky and are explicitly looking for a noexcept move constructor.
In that sense, std::move() is no different than other passing semantics. Just because you wrote at the call site that you want to pass a copy of your object doesn't mean that the callee will actually make a copy of it.