Of course it's the default. It both makes them money and absolves them of having to make a decision (and rightfully so IMO, should be up to the patient and family).
Maybe? There are trade-offs. Since patients can't trust hospitals to stop heroic lifesaving efforts precisely when patients choose (rather than a month later after all the arguments have been exhausted), they end up avoiding hospitals and receiving both less palliative care and less care in general.