The way has opened for advertisements of some sorts on Wikipedia, and this breaches my prerequisites for involvement with the project. After talking with a few people on IRC and reading more on the list, it appears that the project has been thrown into an uproar over this, although the foundation board members and other high-up community members, by-and-large, don't seem intent to keep things commercial-free. I have thus left the project. I did not mind not becoming a Foundation Board member because I thought that things never could/would go this way, partly because I thought those involved shared this value and partly because I thought even if they did not, they would understand the lesson that the Spanish Wikipedia's split taught the community. I regret not having been in a position to stop this.

I've survived other projects making wrong turns before (e.g. NoWonder) and breaking with them. It hurts, but it happens. There are always plenty of other things that I can give my time to though. It still stings though. 4 years...