Like many boaters, I have a strong libertarian streak in me. But i gotta say driving this thread into govt regulation and free market is drivel.
First, for those who have never been, Marina del Rey is not really a marina per se, it's about a dozen marinas clustered with apartment buildings, shops and businesses all around. It's a high density location that struggles with parking and such. The marinas have a right, and frankly an obligation, to regulate charter businesses. To make sure the operators have adequate insurance for the business they operate, there is parking and restrooms for their customers, and the business does not create an unexpected nuisance for boat owners on an otherwise private use dock.
Im sorry, this is not a USCG item except for OUPV licensure. And it's not a David and Goliath issue of squashing the small guy. This is an issue of whether a certain type of business is operating in accordance with local laws and regulations. The example is not Uber vs Taxi, but "Gypsy Cabs" vs Taxi (for those unfamiliar, gypsy cabs are 100% unlicensed, unregistered, and uninsured drivers who roamed the streets of NYC picking up passengers for cut rates).