[theamk]

If all you need to do is to worry about bad luck, you don't really need a service. They should buy multiple SD cards, and keep mailing it to themselves. As photos/videos can wait for a while, the envelopes don't even need to be opened until the friend returns from the trip.

As whether it makes to mail SD cards -- it entirely depends on the country. Some countries have great internet, so you can just upload the photos. Some countries have bad postal service, so the mail can get lost easily.

Either way, if going mail route, make sure to encrypt the cards, and send multiple ones, in case some get lost.