There has been news here and here about Shadow app having a lot of issues in production. It seems like they tried to use some free service to test but because app interface was confusing they couldn't finish the testing and therefore app wasn't finished.
This is yet another example that using untrained human labor for QA testing is flawed and not rigorous enough and one of the reasons why we started testRigor in the first place.
If Shadow had used testRigor even for free this wouldn't have happened. This is what testRigor is designed for. It goes through all the most important paths of a web or mobile app to make sure it works.
It is surprising that to this day people are not using tech properly to test their apps.