I think it's been implied, but there is a legal requirement for dot inspection for any pressurized cylinder on roadways (interstates?). I don't know exact details, but USDOT requires hydrostatic inspections every 5 or 10 years.
VIP was a SCUBA industry policy. It's been around since I started diving. You can visually inspect tanks yourself, and psi freely certifies inspectors (freely meaning you don't need to work for a shop) . I do believe there is value in making sure the tank you breathe from underwater does not have water or rust inside, and I prefer seeing evidence of this when I dive with rental tanks, but I don't generally see this at resorts. As an industry policy, there isn't 100% consistency, and money definitely plays a factor.
VIP was a SCUBA industry policy. It's been around since I started diving. You can visually inspect tanks yourself, and psi freely certifies inspectors (freely meaning you don't need to work for a shop) . I do believe there is value in making sure the tank you breathe from underwater does not have water or rust inside, and I prefer seeing evidence of this when I dive with rental tanks, but I don't generally see this at resorts. As an industry policy, there isn't 100% consistency, and money definitely plays a factor.