Exactly the same as it would have had I received the message by email when it was first sent. No difference.
It's not the same. Here you go on to state the difference:
Mark may need to put some limits on Send To Me to prevent automated harvesting of the group's message archive
Yes, and even if it's not automated. The argument for the fig leaf was always, "The email is fleeting, but the archive stays there." If the archive suddenly becomes sendable, that argument no longer holds.
Messages are the sole opinion of the author.
It's dumb to buy smart water.