Rumor is Cities: Skylines 2 is getting announced today at the Paradox Interactive event
The only way skylines 2 gets released is if they find a way to ramp this behavior up.
All game companies end up the same way in the end. Capitalism demands it.
Honestly I don't find the DLC behaviour that annoying with CS. You can get most of the DLCs on allkeyshop for $5 each. I've probably spent about $100 on the game and DLC and have had many hundreds of hours of gameplay for that, which compares extremely well with many games which are $60/70 and you get a 10 hour campaign max. $/hour CS comes way ahead.