You're absolutely right, but I don't think you go far enough. If a company is too large to ignore - if they insinuate themselves into "infrastructure" roles - then we need to treat them like government. They need to be subject to FOI requests. They need to justify that their work is in the public interest. They must not be permitted to "lobby" (i.e. bribe officials).

I can't see exactly how we do all this, but the root cause of many a social ill is that corporations are taking over social roles from government. This must be arrested, somehow, or we'll sleepwalk into the dystopian future of every damn 70s scifi film.