Second is the advertising business model. There as side effects to this three-way market. In any casefb as business works because they are such a monopoly.
Third is political influence, which I think is at the centre of FB's current heat, not data security. People become presidents on FB, revolutions happen on FB. This gives extra importance to the first two.
FB had been in denial about the politics issue, I suspect they still don't fully grasp it. They're not a neutral platform. They actually built in certain biases via their "optimization" for "engagement". In any case, since people like to argue politics on FB, it's a great advertiaing platform for politics.
I think they will not like the answer to the last problem. Its either an editorial approach, recognizing their position as a publication or trying to get rid of politics.