lbschenkel It's correct that the source is Google Play Store as Aurora basically acts as a proxy but I think there are some valid security concerns with aurora store related to lack of certificate pinning and lack of secure asset delivery. I haven't read too much into it so I don't really know how concerned one should be but I've seen it mentioned in here several times so I do actually think that @Grkrz do have a point.
If one have a user profile with GPS installed for banking apps I would probably advise them to log in to google > download the apps from the play store > log out again