The term is ‘slop’ I believe. I had a KU account for years and since I mostly read GameLit and LitRPG I have been tied to Amazon because very few KDP Authors publish traditionally outside of special print runs.

What annoyed me most at the time I cancelled was authors putting book 1 in KU and then not the rest of the series. Forcing you to buy the books at inflated prices. Kind of like drug dealers.

I read Going Postal and Making Money every year. I have every audiobook version for the books. I sometimes read the third one but I’m still annoyed that his Alzheimer’s got bad before he could write ‘Taking Taxes’ and we got a simpler one about trains.