Yes, I want to chime in here too. My update to ST4 was installed by way of the Sublime Text repository on openSUSE. As a result, it was updated automatically as part of a wider system update - no notification, no choice, nothing. It’s simply not OK to deliver an update like this, and demand money off the back of it. Is ST3 even still available in this repository to allow people to downgrade?
As far as actually paying for the licence upgrade - I completely get the need for everyone to continue to be paid, and to support product updates. However, I think you need to make this much more attractive price-wise for long-standing licenced users - a tiny discount isn’t much of an incentive to upgrade.
I’m really disappointed in you. This has been badly planned, and your long-standing users feel upset with you for not properly thinking this through.