Smash Nation review for Yotpo: Product Reviews App

DON'T USE THIS APP! I used this App about half year,and when i want to remove it from our store, the app no working after i remove it from my shopify admin,but the app's widgets and products customer review form still sticky there,we contact the support team a few times,they do nothing.we have to follew help centre guide to try clear the Comment out the related code in theme.liquid,we can't find nothing.they remove it after about three weeks when we feedback to shopify,it is terrible.