The reason I quit Adobe and bought Sketch was to support software that I could actually buy. Not this "Good deal for professionals, even cheaper for students, fuck anybody who just wants to use a decent art program every couple of months" model.
I'll see what I can track down on details, but I'm preemptively very disappointed about this.
EDIT: Sketch is _NOT_ switching to a subscription model. Sketch is breaking from the "paid major, free minor" upgrade schedule, and going to "rolling releases, $99 buys the app and a year of upgrades."
Personally I think that's a fair system. It frees them from having to plan new features around the major/minor release schedule, but you can still buy the software and just keep using it.
My biggest concern is going to be OS compatibility. With OS X on a yearly upgrade treadmill, if there are any compatibility issues (and there almost always are), then the Sketch upgrade is effectively not optional. That's not so different from how it is now, except there have only been two major upgrades since the original release (September 2010), so you'll be buying OS compatibility fixes more than twice as often. So I still don't love it.
https://blog.sketchapp.com/versioning-licensing-and-sketch-4...