I always wonder when a company does this if it is completely altruistic or if something else is going on behind the scenes. Maybe notifying customers gets them to reactivate, maybe if they resubscribe later they can charge more, maybe it’s better for financial reporting and projecting subscriber counts. On the other hand it could just be a rare moment of a company doing right by the customer.
(Also netflix would have to report all those unsubscribes to shareholders, but this way no one cancels and they're framing it positively as consumer-friendly).
So if netflix incentives people to people keep their accounts, they remove the friction from what would otherwise be a high-friction resubscribe.
As long as netflix believes they can get people to come back for an occasional exclusive content hit-show, then they can reactivate the payments for a while.