Funding the opposition is great. However, if there are profits to be made if a law is passed, and zero profits to be made if a law is not passed, there will likely be no companies all that interested in helping ensure the stoppage of the law.

And people who may care very much about stopping it may work at a company who wants a law passed. The people who work at the company have much less spending money than the company itself to devote to promoting such legislation.