I believe this "app" was nothing more than another leftist tool that would be used to control the flow of information and "adjust' the outputs in hopes of controlling the outcome. It most likely had a bunch of backdoors as well as hidden "controls" that they weren't able to fully test before their first "Big test".
Also, I saw an article that the DHS offered to test the app for the DNC, and were turned down. Wonder why? Inquiring minds want to know...
Same reason the DNC didn't want the FBI to inspect their servers.