I agree with your sentiment, but this actually highlights just how necessary it is to not solely trust the large players with our personal memories; by relying on a single, walled garden to play host for our memories, we're increasing our dependence on the larger players. Data privacy concerns aside, what happens if they decide to change the terms of service in a way thats unappealing, or the product itself? Or even lock us out of their service?

Far better IMO to not rely on a single provider, especially in the case of backups.