Google does nothing about "cloned" fake apps, just look at this ask.fm clone, for example, which has been there for years and the developer is getting rich from 5M+ users and tons of ads inside: https://play.google.com/store/apps/details?id=com.wAskFM
Actually, their Developer Program Policies prohibit "a webview of a website not owned or administered by you": https://play.google.com/about/developer-content-policy.html But this is only a rule, that does not mean anybody enforces these guidelines ...