Re the first question, you have to park at least one wiki on said domain for around a year, during which Google will refuse to show other page other than the main page. That's just not really a realistic option is it.
> There’s a bit of light at the end of the tunnel, though - based on our experiments so far, it seems like once we establish these new wikis fairly well on Google, it should be safe to move them off weirdgloop.org back to whatever the appropriate name was, while keeping the existing Google juice that the subdomain picked up. I’m hoping that in 6 months or so we can just 301 redirect overwatch.weirdgloop.org to overwatch.wiki, use Google’s change of address tool, and put these wikis to where they should have been in the first place.
For people who regularly get into new games its much easier to learn just one easily distinguished domain with the high quality wikis.
overwatch.weirdgloop.org works better than overwatch.wiki in this sense, apart from the complaints about the odd name up in the comment chain.