Basic O/W is 60ft. Advanced O/W is 30m (100ft). I think it used to be 130ft.
Must be the lawyers because the physics didn’t change.
Resort courses are different and three days is not enough to be a competent diver. There is no “scuba police” and you can go as deep as common sense, training and experience dictates. Many of us who are avid underwater photographers go much deeper than 60’ on a regular basis and dive without buddies....
Some organizations (like PADI) have you pay to get your next ‘merit badge’, and charge you another $200 to go below 60 ft.
NAUII/PADI instructor (now emeritus) since 1979....