This is an obtuse argument. The obvious point being made by the parent is that Facebook, as all companies do, will at some point or another put its own interest

This is an obtuse argument. The obvious point being made by the parent is that Facebook, as all companies do, will at some point or another put its own interests above those of its users. When you're selling widgets this is usually no big thing and you just start to fade away or have to reinvent yourself, but when you deal in personal information it's a different story.