As you can see from the date (in 2018) and the fact that they are talking about renewing the subscription which Quicken 2017 and below don't have.  This guarantee doesn't apply to Quicken 2017 and below.  So @Quicken Jared is quite correct in pointing this that doesn't apply because the title of this thread is "Migrating Quicken 2017 from old to new computer - Quicken Data Access Guarantee"

Which implies they original poster and others think it does apply when in fact it doesn't.Also I would point out that is statement isn't correct either:

Again the "coercing the OS" is an assumption made by the users.  Nothing that was ever stated.And it was the failure of the users to understand what having to being forced to log into a Intuit/Quicken Id implies to register/access their data means.

I warned about this for quite bit back then, but it mostly fell on death ears.Quicken Inc could go out of business tomorrow and the servers shutdown, and no one would be able to log in (subscription people too).

It is my belief that Quicken Inc didn't purposely cutoff anyone.

They changed the login system for some reason and that broke the login for the older versions of Quicken.  To them this is no different than if there was OS change that broke an old version of Quicken.They weren't actively trying to break old versions, but they are also not going to spend any resources to fix anything in the old versions if something they are doing for the current system breaks the old versions of Quicken.