I agree with you on everything, but I think a better gun analogy might be: do you believe a person should be able to buy/sell one gun without anyone knowing? If so, do you believe that person should be able to buy/sell 10,000 guns without anyone knowing? Should a multinational corporation be able to buy/sell thousands of guns without anyone knowing who they are or even that it's happening?
As for the practicality, transactions can be split up, yes, but unless there's black-box privacy, volume anomalies can still be observed, which is useful data.
You either have privacy, or you don't.
The problem is that you keep wanting to create exceptions where privacy would not apply. This will introduce a loophole that somebody will eventually exploit to invalidate privacy for everyone.
This is happening right now with the 1A and 2A in the US.
As long as everyone has the right to defend themselves with weapons, it makes no difference if someone is allowed to buy/well 1 or 1000 guns without anyone else knowing.
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