Receiving unintended funds can have all kinds of unintended consequences, including related to law enforcement.

In his case, he just got suspended and asked to provide documents he is physically unable to produce (contrary to presumption of innocence).

the next day, and after almost two weeks since the refund to place (but only one day after the long phone discussion) my account was blocked as "suspicious" activity and in order to unblock it I will have to provide original product receipts of the product I was "selling", something that I do not have as I do not even know what I was selling!

Yeah but it didn't here. Any negative consequence this man experienced was due to his anger and outrage. Calmly handling this situation would have resulted in a completely different outcome.

Yet again, emotion and anger are now somehow the company's fault.

If the customer’s emotions are affecting their account status, then it is entirely the company’s fault. If a customer is upset, a federally regulated financial institution should never be able to just shut down their account without recourse. That’s why we have regulations and laws, so some random customer service rep (possibly from a country with far different rules and regulations) can’t power trip over a customer.

He is upset about the reversed deposit not being notified. I thought it was pretty clear from the post.