Extended support implies them having to actually support something, providing security updates for it and taking extra care of the version. Docker could charge

Extended support implies them having to actually support something, providing security updates for it and taking extra care of the version. Docker could charge for extended support, charge for a LTS version, and even turn features they'd would otherwise deprecate into premium features. This here is merely attempting to prevent the user from running an unsupported version on their own machine. Software tends to be about "solving user's problems". The only problem this "anti-feature" is solving is one of its own creation.