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?