This seems more like a crusading left wing tendency to me:
LOL... I think you're confusing port with starboard.

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This seems more like a crusading left wing tendency to me:
I recently noticed one of the more expensive ops in Cozumel has added a new "rule" requiring 500 psi in the tank when a diver returns to the surface. That silly rule made me go find another op for my trip last month.
I see you're new so perhaps you don't know this feature but if you click on someone's name next to a post a list will drop down and it will have a feature to ignore them. This means you won't be able to see their posts and won't have to read the posts you don't like.
Which is true unless somebody quotes that person...
The shop near me has a rule if you rent their tanks that if it comes back with less than 500psi, you will be charged a VIP fee....
Umm, what is their justification for this?
If you breathe the tanks to zero, water will enter the cylinder if your press the purge button. Then the valve and cylinder have to be cleaned and inspected.
The shop probably wants to dissuade people from breathing the tanks down to zero by charging them if they get too close to zero. The shop probably set the lower limit at 500 PSI to ensure a good buffer.
Cleaning and inspecting a valve/cylinder is very time-consuming and a pain in the ass. It is much easier to keep water out of the cylinders so that you only have to do a quick VIP every year. Pop the valve, take a peak inside, re-install the valve, done.