Take for example the Sim City world: https://www.youtube.com/watch?v=c3oFKhftK88
If you didn't play the Cities XL beta nor were around for the first bit of Cities XL there was something called the "Planet Offer". The world map Maxis shows 12 seconds into the trailer looks just like the Planet Offer's globe. Maxis even shows a commodities market at 22 seconds which looks like the Planet Offer's trading.
Just like the Planet Offer things did not work out as planned. Core components of the city builder were left undone such as the terrain manipulation or map creation. In part I suspect both were business decisions made to allow a DLC market.
From the beginning EA promised DLC. In the case of Cities XL the DLC was less obvious. The way things worked out the developers of Cities XL went bankrupt and the game was bought out by its current publisher. Every Cities XL game since has just been the original edition plus some extra maps and buildings.
The real shame is that both Cities XL and Sim City 2013 were beautiful and did not lack anything art wise. Instead they just failed at game play. Part of said problem was crippling the game to open DLC avenues. The other part was horrible balancing.
In the case of Cities XL there was no balancing. Every city service cost the exact same with no room to adjust service level like in Sim City 4. Cities XL also made the mistake of tying medium and large density zones plus most services to your city's population. In effect every new city felt the same since you had to bootstrap everything every-time. Of course finances were also dead easy to balance.
During Cities XL beta my biggest problem was opening enough inter-city transport capacity to export my over supply of office services. For a while I could just open international airports one after the other but I soon ran out of space. My city got so big I triggered a rare bug where the game replaced my entire city with a hilly field. Since said hilly field had no export routes I couldn't rebuild. This was a shame since the glitch managed to delete everything which was costing me money but leave all the export revenue. Thus despite being a hilly field I must have amassed more money than any other city during beta.
Sorry back on topic: just like Cities XL's planet offer Maxis is now stepping back from the online. In theory online would be fantastic but first you need to make a fun city builder. Maybe in the future we'll get one.