I get where you're coming from, but in fairness the model can work. Cities Skylines 1 DLCs did mostly add substantial content to the game which over time built it to what it is today. At launch CS1 was a good game, far better than the premium Sim City 2013. I have over 1000hrs in the game so for me I think it was good value; and a lot of people bought the game over the years on heavy discount with a lot of the DLCs bundled.

The downside with this model is when they release half baked games and withhold core game mechanics to engineer DLC. From what they've released of Skylines 2 that doesn't seem to be the case - it seems to be a fully featured city builder with more at launch than CS1 had. Obviously it will depend what the game is actually like and launch and there are obvious hooks for DLC already.

I compare that to a game like Sim City 2013 - that released as a premium game, with a shitty reduced game scope, basic missing features and an always on-line DRM requirement, 1 crappy expansion and then completely abandoned by EA in a crappy state despite selling 2 million copies.

If I had to pick a model I'd pick Paradox's.