I believe the specific purpose of that is to appeal to the parts of companies that engage in professional ass covering for the hot potato.
That is, if a well-established company offers you a service explicitly promising no human bones in the soup, when all the other services don't promise that, you can make a reasonable argument that, in the event you were required by circumstances to pick one of the services to use, you have done the best you can in that circumstance, even if human bones ended up in the soup, as long as the company doesn't have a known history of not honoring its commitments.
And in that case, it becomes easier to make an argument to your management chain that you didn't deliberately put in human bones to save on cost, you picked the one that explicitly promised no human bones.
That is, if a well-established company offers you a service explicitly promising no human bones in the soup, when all the other services don't promise that, you can make a reasonable argument that, in the event you were required by circumstances to pick one of the services to use, you have done the best you can in that circumstance, even if human bones ended up in the soup, as long as the company doesn't have a known history of not honoring its commitments.
And in that case, it becomes easier to make an argument to your management chain that you didn't deliberately put in human bones to save on cost, you picked the one that explicitly promised no human bones.