I tried Fountain as my main podcast app a year ago. My main metric for a podcast app is, will I get in an accident using it while I'm driving. The answer was unequivocally yes with Fountain at that time. It was constantly messing up my queue or losing my place in the podcast. 

I moved to Podverse which supports sat streaming and boosting and is GPL3 licensed. It's not perfect but it gets the job done with minimal messups. I don't feel a need to try closed source Fountain again.