Makes sense considering Android makes up 71.74% of the mobile market. Especially emerging markets, which is right up their wheelhouse.
Personally I have never been anything but annoyed by the whole concept of the short videos, but my 5 year old daughter likes it. But then again I also get irrationally angry at programming tutorials in video form as opposed to text, so maybe I just don't "get it".
The tech is made to be addictive. You shouldn't let children use such a thing IMO.