I've raised this issue on this forum many times before and I'm glad to see other pple share in the same thought.
You'll find someone asking on here questions like "Adsense rejected my blog, how do I get approved?"
Then you visit their blog and you find an article above fold with the title " How to get approved for Adsense within 24hrs and only 3 articles".
They're clearly selling bullocks to their readers and are as you rightly said, money is the only motivation here.
Fortunately, these blogs have a lifespan of 4 months max.