I once did this by accident and without a bot farm. It was very lucrative.

What I did was create a game with an action button. Then I served ads right next to the action button. I didn’t realize people would miss click on the ads at a high rate, but they did. They fat fingered it, clicked the ad, I got paid.

I looked into it after a couple weeks because my click rate was crazy high.

That's definitely a core principle of crapware that's widely done. Put that ad 0px away from the "mash here like crazy" button, PROFIT!