What another company does or does not allow regarding travel really has little bearing on what YOUR company does or does not allow. (Unless you are in a position to influence travel policy)
Many large companies have detailed policies that go through endless review at upper management level before being pushed down to the actual travelers on a "take it or leave it" basis. Then their policies are constantly being revised because users are always trying to find ways to beat the system. Another way would be to ask travelers what THEY would like to see in a company travel policy. Either way, you end up with a policy/guideline/regulation that works for your company. Different companies? Different policies.