I saw your post, terrifying!
We haven't seen anything like that so far, though right now we're requiring CC to sign up so that filters out all these spammers usually. At least, i've never seen any go that far since there's easier targets. We'll manually build a saas trial for people who don't want to give us a cc but that wouldn't be spammers contacting sales like that.
We still get a fair amount of fake trials for the download version which doesn't require a cc, but I assume that's people hacking it and using it illegally. I don't bother tracking them down.
With Snappy I believe we did have this happen. We put in a 1000 email limit or something like that and then the trial would shutdown. This seemed to discourage them enough, though I don't think it was as large an operation as you seem up against, so maybe it would still e worth it for them? Perhaps something like https://siftscience.com to try and stop them up front. We'll probably do something with them eventually just to keep our trial stats cleaner.