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A privacy policy could literally say "our policy is to track and store nothing". Having one does not make it evil.
In the case of Google, I would not be surprised if it stays running in the background using a relatively large amount ram just for fun.
In this case, it redirects to Google's general privacy policy that covers all their services. Anyway Google's calculator stores a history of all the calculations you did in your account somewhere. So I guess it needs to have a policy stating what they do with that data.
It's shit like this that makes me want to never use another Google app or service.
What possible justification is there for storing history of calculations in a calculator app?
I'm not saying I agree with their justification but I could see why they might be collecting yet another data point: education level. If someone constantly uses a calculator for simple calculations they might have a low education level. People in that demographic will be served different ads than more educated people.
It sucks, but I could see Google doing that.
At some point somewhere, someone is going to figure something out with what you typed into it and advertise something to you.
while True(): youtube.background.play( video=rick_astly_nggyu, exclusive_ads_mode = true, audio=mute )