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This made me want to look up if transfused blood even contains antibodies. An interesting thing I found was that receiving a blood transfusion around the same time as receiving certain kinds of vaccines can make the vaccine ineffective. If the donor already had immunity, their blood could contain enough antibodies to destroy the virus before the recipient's own immune system can react to it.

I wondered if blood transfusions could work as a form of vaccination, but the transfused antibodies degrade quickly and aren't replaced. If someone who wasn't vaccinated for COVID received a blood transfusion from someone who was, the recipient would temporarily have increased immunity. However, the antibodies will degrade and won't be replaced since the recipient's immune system isn't actually generating them.