I self-assign with a few exceptions. I will apply for shops when I know it is a shop I will get and I know it will be assigned within a day or two. Generally, I have no issues with applications for RGB and Pinnacle, and maybe Bare. I do not pass on guaranteed money. That does not make any sense. So, I'll go delete the application if need be.
As for Gigspot, if I were you I would ditch it and sign up with each company individually. You'll see jobs that do not go to the app.