Ken White has been talking about the potential for this suit for a couple weeks now. He spends a lot of time talking about what isn't defamation --- people use defamation suits and threats thereof to chill free speech, and he's a 1st Amendment guy --- but the Dominion cases are apparently examples of very serious defamation cases. The core of defamation is (1) a false statement of purported fact that (2) causes damag…
Dominion seem to be spinning this out as a campaign, so I doubt Giuliani is the end point. I also doubt Trump is the end point.
So now their owners[1] need to figure out how to get whatever value they can. This isn't a "campaign", it's just a business effort. They've been transformed into something like an IP holding company, where the IP is the damage suffered by the original outfit. They'll sue everyone they can.
(They'll also probably manage to recoup some value by selling what's left of the company to someone else who then rebrands them and tries to sell back into the markets that have been poisoned. Something very similar happened with Diebold a decade ago, which was then sold to ES&S and thence to, yes, Dominion.)
[1] No idea how they're structured, but per wikipedia they're a private corporation.