https://medium.com/luminasticity/does-betteridges-law-still-...

It seems it may also be used for really embarrassing things that will make powerful people mad if you just state them outright so it is necessary to state it as a question when you know the answer is yes.

Of course any yes or no question can be answered "no" but Betteridge, as we know, means a factually correct answer, and so there are these edge cases where the question mark is used for slightly different reasons than the law assumes and can be answered "yes".