This is an even clearer example than usual that safety considerations are NOT the issue when it comes to removing tried, tested, simple and more importantly CHEAP solutions to problems that are a potential gold-mine for commercial suppliers.
There are those who believe copper is a problem - but this news proves that copper is not the problem:
Any argument that copper oxychloride is safer than the copper hydroxide or carbonate in bordeaux mix (or burgundy) is laughable; (in my opinion - having spent my entire working life in Science - copper's opponents are all wildly mistaken or naive anyway, or they might have another agenda - paid or unpaid Trolls).
Every one of the complex remedies of the last 50 years has been proved to have insidious and (more importantly) persistent health problems - the only way to make big money is to bring out something new in a market where there is no alternative - and make money hand over fist until the health dangers appear a few years later.
Cheers.
PS. It is dead easy to make a safe chemical illegal - you simply refuse to fund its regular checking schedule - because it costs more than the profits. Of course this method is also used to quietly kill off dangerous substances 'for commercial reasons' before the groundswell of anecdotal evidence interests the press.
