I think they are smart enough to avoid that. They’ll probably send invoices and some small percent may voluntarily pay to just make it stop quickly. Others will ignore, but their amount due will accumulate to a point that this company will be able to sell those accounts to debt collectors.

I would love nothing more to learn that a debt collector got screwed buying up these accounts, but how is that not fraud on the part of the company, since the resulting debts are clearly not valid?

Oh, it's totally fraud! Unfortunately it's a fraud that is easy to get away with.

If they’re still running the billing code I worked on back in the day, it’ll just charge all the cards

I got the "invoice" as well.

They don't have any payment method for me, so I assume they will let the invoice sit for 90 days, then send it to collections.