It's fair to question whether the play store is the number one source of scams, but you should also question whether google actually does enough to keep scams off of Play, or is that just a pretense.

If I search for "DeepL" the first hit on the play store is "Preply" whatever that is, only the second one is actually DeepL.

Is Preply a scam, or an ad? You can dislike advertising, but ads aren't scams themselves.