Ever since Facebook introduced the Chat Heads user interface, there has been a noticeable rise of apps that show what is best called “floating windows” on top of other apps. This is especially true on Android, which has a more lax system in what developers can and cannot do. These floating windows range from browsers that load pages in the background, to buttons that popup to call your attention, to lyrics that display your currently playing song. It seems that Google has taken notice of this trend and has decided to tighten the leash before it gets out of hand.
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https://www.slashgear.com/android-marshmallow-disables-floating-windows-by-default-08402319/