But the corporation who invented the replicator would have trillions and would theoretically be able to out lobby them.

I supposed we'd reach the inevitable equilibrium: Corporations are allowed to use and profit from replicators, but individual people are not.

Eventually replicators that can make other replicators would get invented and then who can or would care to enforce those laws?

Everyone has access to the "copy / cp" commands, yet the USA to this day criminalizes its use on certain digital files, at the behest of the (relatively small) Copyright Industry. I have no doubt that a working "copy, but for physical stuff" would be criminalized in the same way, this time with massive physical goods industries pushing for legislation. Enforcement would be draconian.

> Enforcement would be draconian.

Or at least some industry advocacy group would resurrect the "You wouldn't download a car!" ad campaign.

If it was an almost-replicator big corps would mass produce it and sell it. If it was an actual replicator that can also make other replicators you'd only need a few of them before anyone can get one from their neighbour.