It means "too long didn't read". Many people are too busy to read long articles or listen to videos longer than 10 minutes. Videos often are full of useless filler that take a long time to get to the point, which is a main reason I just don't watch many videos now. Many videos don't have any useful details at all, just vague inferences used as click bait.What is a TLDR?
Plus information overload is a thing. It's hard to tell which sources, or stories, are worth reading in the first place.
I don't mind reading stuff. But I want to know if it's worth reading in the first place since my time is limited.