The reason it's not researched much is because giving someone an antibody will not confer immunity - it will only treat the immediate virus.
It has value, but there are usually better treatments available that more broadly fight a variety of viruses and don't need to be so specifically customized as an antibody.
I suppose testing would be easier for a cure (compared to a vaccine)? Given that only the "adapter" needs to be specialized, I was wondering why there don't seem to be any approaches based on antibody mass-production....
Apparently it's grown quite a bit since I've spoken to my friend. When we last checked in, it was a little startup. Now, it's a $2.4 billion dollar operation. I guess my friend is probably worth a few hundred million right now.
It has value, but there are usually better treatments available that more broadly fight a variety of viruses and don't need to be so specifically customized as an antibody.