...Most probably because they understand that some people copy and paste straight from the internet and don't want any of it. Therefore, you get nothing for this as there is nothing that came straight from you other than a copy and paste from this site: https://www.sciencealert.com/15-really-good-things-that-are-happening-in-the-world-right-now
If you are using ANY information directly written in the internet, or a book or anything else, it is not yours, it belongs to the person who wrote it or made (pictures, songs, videos, dances, etc.). You need to produce your own original content, though you can quote people or songs or share snippets or videos to underline your thoughts or ideas...
As I told you, make sure you read the whole introduction to what Steemit is all about before posting. for the moment, just start with that and do the voting. this way, you will learn from seeing what works and what doesn't work here on this platform. Talk to you very soon! Maybe you can write your argumentative text or your Christmas tale accompanied by a few pictures!?! Don't forget to let us know where the pictures come from, especially if they are not yours!!!)
Namaste :)