Ian Betteridge, a British technology journalist:
[...] any headline which ends in a question mark can be answered by the word "no". The reason why journalists use that style of headline is that they know the story is probably bullshit, and don’t actually have the sources and facts to back it up, but still want to run it.
I didn't know that it was a thing, an adage, or even a law.
If you read the news every day, you probably figured that out by yourself, after you had been misled by numerous catchy articles of that kind.