Yes. You are correct, Jeff. The P2P usage is sparing Totem's servers from the extra load, specifically for previews. But according to my info, it can still also be used to download purchased cards.
Imho, if someone has, for some reason downloaded a corrupt file due to connection issues or whatever, this can then be shared with the masses and cause some or all of the posts regarding problem clips that others don't necessarily have.
So, for downloading purchased cards, it's best to disable P2P and turn it back on for demos afterwards 😊