We cannot generalize this hypothesis not all transactions that are "error" sent cannot be returned, the problem is proving this in court.
In my country, you can request a reversal of the transaction if the second party claims that he is entitled to the money, you may not be able to recover it.
In Bitcoin, if you err, there is no chance of even 1% to recover it.

Citi bank lost 400 M or users lost it?