I saw a post elsewhere online claiming solo diving isn't allowed the in Caymans; I don't know the original reference to support that.
That seems to be a common belief. As far as I know there is nothing in Caymanian law prohibiting solo diving, and the supposed prohibition is based on the Water Sports Operations Guidelines promulgated by the Cayman Islands Tourism Association. AFAIK, membership, and therefore compliance, is voluntary. Section 12 is about unguided wall (which means deep) dives from boats, and paragraph B. says "Operators may elect to allow customers to do unsupervised wall dives with their buddies. It is
recommended [my emphasis] they meet the following criteria (there are 4):
1. The divers must show proficiency at the members discretion.
2. The divers must dive in a buddy team and each member of the team must have a computer and understand computer diving techniques.
The first part of B implies that you can only go without a DM if you're with a buddy, though the next bit seems to say it's only recommended that divers "must dive in a buddy team".
Paragraph D is about unguided shallow dives, and says "supervision is at the discretion of the individual member."
There doesn't seem to be even a suggestion that the dive op should require diving with a buddy for shallow dives. There's also nothing that says a buddy is necessary for shore diving, regardless of depth.
My only personal experience goes back to the days when dive ops could chose to belong to the Cayman Islands Watersports Operators Association. I can't speak to what any particular dive op would do if you tried to go unguided and solo today, though I had no trouble when my wife sat out an afternoon dive back in the days of the Cayman Islands Watersports Operators Association.
You can find all of the "safe diving standards" here:
Safe Diving Standards | Cayman Diving, Dive Caribbean | Dive Cayman
No money... no bureaucratic interest.
Maybe in your dreams. Pretty much every bad law that was ever written started when just one idiot had a bad idea. Most of those bad ideas die without becoming an official statute or regulation, but plenty of them make it all the way. Here's an example of each to go along with the story that somebody (oh yeah, it was you) posted about the knee jerk (and totally clueless) reaction to snorkeling deaths in Hawaii.
Because people who buy their bikes at Walmart typically can't figure out how to properly use a quick release and there have been a relatively small number of mishaps, the people who buy $4000 titanium racing bikes also get bikes that have tabs on the front fork drop outs that prevent you from removing the wheel just by opening the lever, which is the reason the quick release was invented.
A few years back a legislator in Massachusetts introduced a bill to require that every kayak instruction class start by teaching the wet exit (how to remove the spray skirt and get out of a capsized kayak). That means every one day introduction to kayaking, and every 2 hour clinic offered to advanced kayakers and every class teaching experienced kayakers to become instructors. It was precipitated by a single death.
As for all those deaths in the Cayman Islands, they also include snorkelers, swimmers, and even a boater:
Man killed in Jet Ski collision :: Cayman Compass