From someone that made money from ~40 sources different apps last year, I would say download the thing and try it a few times to see if you like it or not all the thru to how you get paid. Almost all of these app-related photo gigs are very part time and locations vary. Take a few in the beginning even if out of your way a little bit just to get the experience. Then decide how you may want to incorporate it in your life or not and, if so, under what conditions. Your experience will answer your questions. By the way, I don't download everything but I usually look to see that someone has had a good experience with it and if so, I'll try it. Your life and how you use these apps is more important than other people's opinions and realize business conditions change or have some seasonality to it.