Is there any way to prove that Google does delete your ID (from their database?) when they confirm your data of birth or do we just have to take their word on it? Is it really paranoia if I believe they will keep it when they say it will be deleted shortly after verifying?
It is not a falsifiable proposition to assume that Google does not delete that information. Is there a way to proof it false, unless you work for the relevant Google departments?
A better question to consider is perhaps, “What level of privacy should I expect”? With or without that information being stored, you certainly cannot hide from well-resourced governments. As for commercially distributing that data — yes, you would just have to trust them based on the lack of such incidents until now.
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Obscure data other than relevant ones.
You just have to take their word for it.
Yes.
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I would not trust them to and it might also be problematic if you use a different name foe your account. I personally would never submit my ID to them.
Not long ago LinkedIn also demanded an ID from me and I challenged that legally and eventually they let me in again without providing it, which made their point even weaker than it already was before.
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Not sure I understand what you mean
Might be even more crazier, but what if they kept a backup of the IDs even if they do delete it, which makes no sense, but let’s say they do: Would it be possible that if Google gets breached, could it also include my ID along with my other credentials? Has there ever been a breach where hackers do gain people’s IDs?
Many
Surely not impossible. Nothing is 100% secure.
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A backup means as much as an archive were supposingly less people have access to.
Is this mandatory for everyone?
Except GOS users.
Never trust Google services 
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