What is a TL;DR anyway? The core of an article in fewer words, an alternative title, an excuse for laziness, a tool for busy people, a bird's perspective? Some

What is a TL;DR anyway? The core of an article in fewer words, an alternative title, an excuse for laziness, a tool for busy people, a bird's perspective? Some people like writing a TL:DR, it's an attempt to reverse the article's conception, it's game-like. The problem is when we assume TL:DR to be a perfect distillation of the article and comment on it. And, do writers mind being TL;DRd?