For example, I found this random question just now:
https://www.quora.com/How-does-blockchain-technology-work-11
About half the answers there are actually to that question. The rest are to questions that are about the same thing but with different wording:
* 'How does block chain technology work?' * 'How blockchain technology works?' * etc
or to related but not quite identical ones:
* 'What is blockchain technology and how does it work?' * 'What is blockchain technology, could you explain it in an easy way?' * 'What is a blockchain?'
So you'll see a lot of answers... which may or may not actually be for the question you were interested in. Or which may explain it in a weird way, since the actual question they answered was worded very differently.
At least with StackOverflow you know that the answers are all related to the same question.