They most certainly will... But at least the money was sent.

Nothing they can do to stop that.

No the average person is less well off in a world where $1 billion can be moved anonymously.

The need to move such funds anonymously is usually due to illegal activities, money laundering, or at least tax evasion (evasion, not avoidance).

This leaves every average person at the very least, on the hook to pay for those taxes evaded, or lacking the services they would have provided.

If the need is due to criminality beyond tax evasion, every average person suffers the corrosive effect of that criminal activity (e.g., while I'm for most drug legalization, I can't begin to argue that organized criminal drug distribution is anything but a massive destructive tax on society - & in fact, a main point of legalization is to eliminate that corrosive costs of gangs).

So, the average person is definitely worse off with the existence of an ability to move & billions anonymously.

(edit: avoided/evaded)

Bitcoin transactions are already being de-anonymized at least in the U.S. - and if not today, the permanent ledger record means that the 'data exhaust' (hidden data surrounding a transaction) can back into it.

I don't know, is it that different from being able to send an encrypted message, or lock something securely in a safe?

not with a multi-signature address acting as escrow.

2013 called and wants its arguments back