Out of curiosity, do you know if these containers also obfuscate browser and device fingerprinting? Separating cookies is important but unless it also blocks fingerprinters (in a different way for each container) the site will instantly know the same person is using both accounts.
It just links to the overall Google privacy policy, in accordance with Play Store rules mandating privacy policy being easily accessible to users.
The calculator app doesn’t request any permissions which you can check in settings