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何かのアプリ入れるとついてくるっぽい事言ってる人が居るね
This lockscreen replacement is caused by an ad from DU Quick Charge

I am pretty sure that this lockscreen was added to the app "ES App Locker". Many User-Revievs are stating that this app comes with lots of unwanted ads and lockscreen-replacements.
So you either have the option to turn this settings off apparently or remove this application.
You can check the user-reviews here: Google Play Store

ES App Locker
https://play.google.com/store/apps/details?id=com.estrongs.locker