Uhm, I'm not calling the sentences my own, I'm calling the deck my own. I have three decks on Ankiweb and I want people to know they were created by the same person. What's wrong with that? Nothing.
As for giving credit, the majority of decks in Anki come from textbooks and language classes, it's unavoidable since the decks are created by learners, not native speakers. When my deck had only two or three sources, I also listed them (Talk to me in Korean, Korean Grammar in Use, Click Korean), but gradually the pile of books grew and now I don't see the point of listing them all. This deck is not representative of any textbook, and it doesn't replace any textbooks. It's simply a convenient way for people to practice what they have learned.
And finally, if you look carefully, you will notice that not all the sentences have audio. It's because I created this deck using my own methodology and I thought the sentences were needed even though they were not in my normal resources, so I got them somewhere else. You have no idea what you're talking about when you say I'm just "reorganizing someone else's work". I have spent more than 1000 hours working on this deck and I haven't received any money for it at all, I'm just doing it to help others learn Korean easier. Comments like yours make me wonder why I'm doing it at all.