They are privileging speech rights from some groups over other groups (unions v corps).
They are however, groups of individuals.
I can't poison a billion+ people like monsanto did and then pay a portion of the profits as restitution. If I poison 1 person I go to jail for life.
Of course, not every company may find it worthwhile to do that. So on the whole, it will probably mean companies that aren’t that involved in political spending will become even less involved. But, the largest spenders may find it worthwhile to re-incorporate so they can continue to do it.
NOW, we need a seperation of business from state, where state regulation is explisetely antagonistic to mega business/bank acumulation of assets/capital. It has to happen, and soon, or China, which maintains an actual functional central government, will thrive, while we decend further into a new dark age.