TheVille

Yeah, both of those reasons are major parts of it, but the overarching reason is that developers/publishers want to have control over their games - and so they want to control the MP experience as much as they can - it can be for money or just to keep tight guardrails on what the game experience is like - remember a lot of people put up servers with crappy plugins or mods and companies don't want their customers to have that be their experience with the game.

I think they went way too far and didn't look for ways to leverage the good communities but what do I know?