I've visited Canada and I've seen the state of the cars...they'd never get the chance to wear out...rust never sleeps.
However....that's not my point.
Cathodic protection on ships and jetties YES that works.
Electronic rust protection on cars? IMPOSSIBLE
Mumbo Jumbo

BUT thousands of these devices have been sold
Most users believe that it works and help to "spread the word" among their friends.

This leads conveniently to my pet hate -- SCAMMERS!!!

The "rust zappers" are just one example of shysters who use a cloak of technobabble to deceive the innocent.

Here my all time favourite

Scam City here we come

Should the government departments (ASIC and Fair Trading in Australia)
act to protect the public from scams both large and small??
or is it just the law of the jungle, predators and prey?