Hi @Michaela,
thank you for shedding some light into the dark! 
I can imagine it’s probably on a case-by-case basis but as it’s quite interesting for me as a developer I’m keen to know. Is there some sort of “right” to the company to become owner of the current app? Let’s say I’ve developed the app, do they simply get the code?
Or is it the other way around and there is some sort of “right” to the dev, as the API probably is publicly documented etc. and the development has been done already?
As you can probably not delete the app (being used in workflows) and put a new one in… there has to be some sort of pre-setting?