Earlier quoted context omitted.
If it's clear and consensual, and not a means of endlessly extracting money for no value. SaaS is almost always rent seeking and brings no value to a consumer. Almost.
You either have a SaaS or a support contract. What makes SaaS any worse or different conceptually or ultimately than a support contract?
I have old versions of a few applications and am happy with their current functionality. I can choose to not have a support contract and still use them. If I encounter problems later, I can choose to pay more for the latest.