We can turn this to a semantic argument over the meaning of "practical usefulness", but in my opinion collecting such information provides no additional benefit to Coinbase other than keeping regulators at bay and avoiding future fines and restrictions.

> why might 'regulations' be in place such that when large sums of money change hands

I have done some work in the financial compliance space. You would be surprised how small some of these "large sums" are and they keep getting smaller even while inflation weakens the value of the currency involved. In some locations, the limit is as low as ~$1000 USD.

Yes the motivation is anti-terrorism, protect the children, national security etc... but in practice it is just a vehicle for governments to collect data on its people. In this case, good actors will behave the same while their data is collected and shared. Bad actors who are aware of these restrictions can just pay the $0.25 to transfer through a newly created wallet and then send without these restrictions while regulators pat themselves on the back for stopping money laundering.

What can end up happening with policies like this? Well if governments, regulators, or monopolies get out of hand all of a sudden you cannot send money to a political party. Maybe all your bank accounts are frozen for supporting a protest or all of a sudden you have no way to purchase a flight to leave. Maybe Mastercard/Visa ban donations to entities like Wikileaks for "moral reasons" while allowing donations to the KKK and other similar organizations. These changes don't typically happen all at once. Freedoms are salami sliced away at a rate that doesn't upset the majority and the norm slowly moves to believe that these restrictions are for our own good. (sorry I went a bit off topic here)

Also, why was "regulations" in quotes? Sorry if I missed something or misinterpreted your tone here. Hopefully I answered your question.