It's not an exploit. Although it is T-baiting and thus warnable like prop abuse preround. You can also kill the player who threw it away(if not a detective).

I wonder, why would it be exploiting?

It's not an exploit. Although it is T-baiting and thus warnable like prop abuse preround. You can also kill the player who threw it away(if not a detective). I wonder, why would it be exploiting?