Why are apps on Aptoide newer than the Play Store? I have seen many of the usual apps such as YouTube, Facebook and Google Maps even, that have a newer version in Aptoide rather than Google Play Store.

How is this possible since Google Maps and YouTube originally come from Google Play Store? Are these apps safe to download from 'apps' store in Aptoide? 

Also on the YouTube app in Aptoide, it doesn't have the 'Trusted' shield, it says 'Unknown'.
Staged rollouts, alpha and beta testing.

APKMirror states testing builds clearly, for example on Google Apps: