Someone can correct me if I'm wrong but what I got was that there's nothing to patent because phages are found in sewers and mud pools as is. Also every individual with a bacterial infection needs a custom cocktail so there's no one-size-fits-all pill that can be mass produced.

Phages also have their own caveats but I don't remember what it is. The TLDR is that in the worst case scenario we still have phages and as far as I understand no bacteria can adapt to phages. But we need to figure out a way to make it commercially viable as you put it.