The related problem with the visual effects industry v. Apollo is that ground-breaking films leave a history. Over and over, if you listen to interviews or follow the mags, you get stuff like, "The original plan was a lot less footage of the bugs; they would mostly be realized with full-scale puppets, a la Alien. But then Tippet brought in a Go Motion rig he'd been developing on his last project...."
If there had been a team of people developing new methods to fake Apollo footage, you'd see the footprint of new techniques filtering out into the rest of the industry over the next few years. This would be even harder to bottle up -- the only way I can think of is having everyone involved sign a sort of long-term "non-compete," aka "I will walk away from the industry and not make another film in any capacity for the next twenty years."
Like THAT'S gonna fly.