There are some very helpful poor reviews of this site so I won't repeat it all, however since teams started, the GS app has improved. I added one awful picture first and then a better picture to the same challenge and the bots can't tell the difference so the first one uploaded always did better. Try View Bug which has lots of free genuine challenges and you can even create your own but neither apps are worth spending any money on. Points are pointless and challenges very repetitive.