Most SaaS services are pre-paid rather than post-paid, so if they cannot bill you, it's easy for them to shut off your service and be out basically no money.
My experience is that the actual terms of service don't guarantee that will happen, but rather that it's more cost-effective for the company to block your account than it is to allow a debt to accrue, document that debt, and then attempt to collect on it or sell it to debt collectors for pennies.
My experience is that the actual terms of service don't guarantee that will happen, but rather that it's more cost-effective for the company to block your account than it is to allow a debt to accrue, document that debt, and then attempt to collect on it or sell it to debt collectors for pennies.