The top result on the Play store for "Guitar Tuner" is GuitarTuna, which is around 200 MB in size if memory serves me well. The second result's reviews indicate

The top result on the Play store for "Guitar Tuner" is GuitarTuna, which is around 200 MB in size if memory serves me well. The second result's reviews indicate that it's full of extremely disruptive ads. So whatever Google is trying to do, for me it has disrupted that "market" by providing an easy-to-find, clean alternative.