When ot comes to statistics, probability, corewllation, causation, they sure are.
Math is funny that way.
The odds of getting "tails" when you flip a coin 1,000 times are the same whether it's a penny, a toonie, a ruble, a franc, etc.
If you want to claim there can be no proof of the blue sky effect of one thing, then you say there can be no proof of a blue sky effect for anything.
That's why no one does advertising. There's no proof the adverts caused a spike in sales, right?
You should try to learn about a topic before you attempt to argue it.