He is the outright (ultimate, through a holding company) owner of The Washington Post.
Therefore there is no conflict of interest. He gets to decide what its interests are.
I think it is worth asking whether it is in the public interest to allow people with other extensive business interests to own influential media businesses, but that is usual these days. Most media is owned by media (and sometimes more) conglomerates with many interests around the world.
He is the outright (ultimate, through a holding company) owner of The Washington Post.
Therefore there is no conflict of interest. He gets to decide what its interests are.
I think it is worth asking whether it is in the public interest to allow people with other extensive business interests to own influential media businesses, but that is usual these days. Most media is owned by media (and sometimes more) conglomerates with many interests around the world.