Ask HN: Why aren't there actual games similar to those mobile game ads?

Hi, I'm talking about games like "Last War: Survival" and "Last Shelter: Survival". Their ads promise a simple mindless game, perfect to pass 10-15 minutes. When downloaded though, we find out that the actual game is very different (base builder, fps), and that they're just pay-to-win cashgrab apps. My question is not about the logistics of these games - there are already a lot of blog posts and videos about this, and we all know it's about the whales.

It seems that people are interested in the gameplay shown in the ad, but the deception is frustrating. Why doesn't any other game studio (or game dev working on a week-end side project) duplicate this gameplay (on mobile, html, anywhere)? Is something preventing them? Are the companies who make these fake games also hope to sue companies that try that for copyright infringement? Maybe there are some real games available, but they have no marketing budget, and are hidden at the bottom of app stores and search engine results?

It's sad that the only thing I can think of, is to learn game development and do it myself. Does anyone have any idea about what's happening?